I thought it is about time to write my own views on correct and elegant wedding attire.
The most important determinant of how a man should dress is the overall level of formality of the wedding, which will either be formal or informal. The thing that sets the tone of the formality will generally be what the bride chooses to wear, as she is likely to have the strongest views on the matter.
This usually means that the bride is wearing a formal bridal dress. This will usually have a full-length skirt. It may have a train or even a bustle, which are very old fashioned but highly formal features on a dress.
A potential bride or groom must understand that the only masculine garment that can match such a gown in formality is a coat with tails. Tails are the equivalent of a train or bustle on a dress. That is to say lounge suits (“business suit” in American English) are the equivalent of an informal fashion dress and to wear it alongside a formal wedding gown is an odd mismatch that should be avoided. In most cases this means that the groom should wear formal morning dress, which is worn for all daytime ceremonies. The cut-off time after which morning dress should be replaced by evening dress is dependent on time of year. In summer, where it remains bright longer, it may be worn until a little later. In winter the “evening” arrives a little earlier.
If the guests are to be in formal morning dress as well, this should be clearly stated on the invitation: "formal morning dress".
For evening festivities after a daytime ceremony the groom must change into evening dress. Only if a daytime reception happens to spill over into the evening hours is it permissible to remain in daywear.
Formal Festive Morning Dress
Modern formal festive morning dress consists of a morning coat, waistcoat and striped trousers.

Formal morning dress looks like this up close:

The only problem I have with it is that the waistcoat is obviously ready to wear. It fits and coordinates poorly with the coat, being too long and buttoning up too high relative to the coat. Too much waistcoat protrudes above and below the coat. More on this later.
The following art deco period fashion plate shows a much more ideal fit of a body coat, and matching waistcoat:

The waistcoat peeks out only subtly above and below the coat. The morning coat finishes well above the knees. The coat closely follows the figure of the wearer. Trousers in this period started to get somewhat fuller in cut, and modern morning trousers may be cut slimmer according to taste.
The Coat
The main features of the typical modern formal morning coat (cutaway coat in American English) are that it closes with only one button, and the lapels are pointed. The cloth is made of worsted cloth in either black or dark grey. The cloth may have a subtle self-pattern in it to give it interest such as a fine herringbone pattern, as you can see in the above example. Oxford grey is a particularly beautiful choice. This is woven with 90-95% black threads and 5-10% white threads to give a fine salt-and-pepper finish seen from up close. From a distance it may look black.
A morning coat should ideally be bespoke (custom made in American English). Tailors call coats of this type, “body coats”, and they are less suitable to be made up as a ready to wear garment because they need to be fitted much more carefully. They are designed to be fitted cleanly to the “body” of the wearer, so as to show off his figure. Younger men with good figures tend to look the best in body coats. Here is what a body coat looks like from behind:

The coat should cleanly follow the line of the hollow of the back and waist. The way the seams fall on a body coat is designed to allow the tailor to shape a beautifully sculpted back. A body coat is a work of art, and only the finest tailors are able to make them. It is traditionally regarded as the ultimate test of a tailor’s ability.
While the modern morning coat is usually a single button pointed lapel model, there are other variants that are permissible. Most of these are somewhat old fashioned, but you may find them on quality heirloom and vintage garments. The following fashion plate shows some fine examples of such variants:

The figure on the right wears a morning coat with a step lapel (notched lapel in American English), so called because it is shaped like a step. The figure on the left wears a two-button model with pointed lapels. Of particular note on this coat is that the length of these two coats is absolutely ideal, and all three figures wear waistcoats that only show subtly above or below their coats. A morning coat also looks more elegant when it is shorter and can be as much as 2-3 inches above the knees. It looks more youthful and dashing to have a morning coat a bit too short than too long, as this causes the garment to look frumpy. If you also look closely at the figure on the right, he also has his coat specially cut so that it closes with links rather than with a button. Links are made with two cloth-covered buttons joined by a chain:

The figure in the middle is wear an old fashioned type of formal coat for morning wear called a frock coat, also called a Prince Albert after the consort to Queen Victoria. It is double breasted and has a silk facing to the revers, which you can see on this beautiful example from the film Kind Hearts and Coronets:

It is a rather grand and stately coat that sadly went out of fashion in the art deco period. If you have a beautiful bespoke, heirloom or vintage piece that fits you perfectly, a frock coat can still add an eloquent vintage touch to your wedding if that is what you choose. Avoid modern oddities that lack the horizontal seam that runs around the waist, as these are not even body coats and tend to look shapeless and frumpy. These strange mutants are not actually frock coats at all, even though cheap rental places may call them that.
One interesting tradition is that morning coats do not take silk faced revers. However, it is traditional for a morning coat to be made up with silk braiding around the edges:

Note the single button closure with links rather than a button. Prince Charles had his coat made up this way with braiding (but without the link closure) for his wedding:

One final variant worth mentioning is the grey morning suit. The suit is made up with a pearl grey coat with matching waistcoat and trousers:

This is worn on festive occasions only, especially in warmer weather. If the groom wears a light grey morning suit, other men should wear dark coloured morning coats. (Incidentally, the fit of the POW's baggy suit leaves much to be desired, although the idea of it remains a fine one.)
Finally, for those unable to bespeak a morning coat, a ready to wear coat may be altered to fit better. However, altering a morning coat is a much more complex affair compared to lounge coats (business suit jacket in American English). A proper alteration may be quite expensive, and only a very good tailor should be entrusted with the work.
The Waistcoat
It is actually very difficult to correctly coordinate the waistcoat to the coat. The only way to get this absolutely right is have them both made up by a bespoke tailor (custom tailor in American English). A great deal of freedom is permitted with waistcoats for morning wear. It can be single breasted, or double breasted of a cloth matching the coat, of light cashmere, worsted, silk, or washing fabric (linen or cotton) in cream, white, dove grey, lavender, biscuit, or buff.
Great care should be taken to match the length of a single-breasted waistcoat to that of the coat front. Prince Philip’s tailor has got this absolutely perfect here:

Notice that the double points on the waistcoat peak out a little below the coat. If the waistcoat has a single point at the front, take care that it does not protrude out too much at the bottom. Waistcoats that are cut perfectly horizontally at the bottom can look bland, as though it were a ready to wear garment, but this is more a matter of taste than of proscribed “correctness”.
The waistcoat should also only show a little above the buttoned up coat. A waistcoat that protrudes excessively above and below the coat looks harmonises poorly with the coat, and it is a dead give away that the wearer's morning dress is a haphazard collection of ready to wear separates.
Some say that a single-breasted daywear city waistcoat should be lapelless but some thought needs to occurs as to how rigidly such a rule should be followed, as it was not always universally followed in the past. Here, the great dandy Count D’Orsay wears a single-breasted waistcoat with the morning dress of his day. It has roll collars and a bottom with a single point to elongate the figure:

Double-breasted waistcoats can also look elegant. These can be made with either a single or double point at the bottom. A semi-U shaped lapel can look particularly elegant on either a single or double-breasted waistcoat. All of these variants are entirely a matter of individual preference, and a certain amount of tasteful fantasy gives the waistcoat a sense of individuality that sets it apart from rental and ready to wear garments:

The above centre figure wears a slipped waistcoat with striped trousers for morning wear. Apart from the waistcoats shown at 7, 10 and 11 o'clock, all styles are suitable with morning dress.
The slipped waistcoat. If you look carefully at this close up of the Prince Charles you will clearly see what looks like a second waistcoat underneath it peaking out from under it:

This is known as a slipped waistcoat. The slip is a piece of cloth that is attached underneath, at the top of waistcoat. It is thought to be remnant of the Regency era practice of wearing an underwaistcoat beneath the waistcoat.
Trousers
The trousers must also coordinate in their fit and cut with the rest of the ensemble. The cloth design for festive occasions is a striped or checked cashmere design. "Cashmere" refers to the design of the pattern rather than the fibres in the cloth. The designs are of a strong black-and-white design, and any old pinstriped trousers in the wardrobe will not do. Alternatives include other black and white dress trousering such as cheviots, houndstooth, shepherd’s check and other similar designs. However, other than houndstooth these classical checked dressing trousering designs are as rare as these days as hen’s teeth - unless you have them specially woven for you. However, H Lesser, Harrison’s of Edinburgh and Holland & Sherry do offer a reasonable range of classical striped trouserings.
This is what striped trousering in a cashmere design looks like up close:

Matching black trousers are best kept reserved in case of a funeral. A suit with matching black morning coat, waistcoat and trousers is called a “mourning suit”.
The most classical trouser fit to match a beautifully fitted body coat is arguably a pair with a slim cut. Rather baggy trousers became an unfortunate fad from about the 1930s onwards, and you can see that Prince Philip is wearing a rather full cut on those trousers in the above picture. He has recently had his old trousers recut by his tailor to slim them down. A slim fitting pair of trouser is a better-balanced match for the clean fitted look of a body coat. The trousers need not be as keenly fitted as those worn by Count D’Orsay, but enough to provide a clean silhouette from top to bottom. If trousers were baggy mid-20th century, then in the mid-1800s, in the Count’s day, trousers were quite tight fitting, but in between these periods trousers were modestly slim fitting like this:

This particularly looks both unexaggeratedly classical, as well as fashionable on younger grooms with fine figures. The trousers can be flat fronted, as in the above Edwardian example, or pleated according to taste. Pleated trousers (single or double, forward or reverse) came in around the 1930s when a baggier cut become fashionable, as the pleats tend to add fullness. Full pleats (especially double pleats) tend to poke out from under the cut away fronts of a morning coat, whereas lounge coats better hide them.
Trousers are best made up as brace trousers. The main reason for this is to allow the trousers to be cut with a higher rise to avoid the trouser waistband from peaking out from underneath the waistcoat bottoms. The waistcoat can then be finished shorter to give the illusion of a longer leg line. The braces (suspenders in American English) also pull on the trouser leg line, holding them straight and erect, further lengthening the leg line to add to the illusion of height. Belt trousers tend to sag and wrinkle more, no matter how tightly you do up the belt. Alligator styled clip on braces damage trousers and should be avoided at all cost. This is what brace trousers look like:

Trouser hems should be finished plain without turn ups (cuffs in American Englis).
The Shirt
The shirt should ideally be plain white or white with self-stripes. Coloured shirts are sometimes seen today, with contrasting white detachable collars. Those who find a plain white to be too harsh for their complexions in daylight should consider ecru to soften things out. Otherwise, an understated grey striped shirt or a pale blue shirt is considered acceptable.
The collar should be a white, detachable stiffly starched collar. The tunic shirt should not have a bib such as those found on evening shirts, nor should it show studs. However, it should close with cufflinks. Currently, it is most usual to wear a turn down cutaway collar. Although rather old fashioned today, stand up collars, whether winged or imperial, may also be worn, provided they are detachable. The height of the collar should be proportionate to the neck of the wearer. Men with thicker, shorter necks should stick to turn down collars.
The shirt should a plain front and without a "bib" of the sort found on evening shirts (which are starched and made of either plain or piqué).
Neckwear
The tie is usually a four in hand (although some will prefer a Prince Albert or even semi-Windsor, the ungainly full Windsor should be strictly avoided), especially with a turn down collar. However, a four in hand may be correctly worn with a stand up collar, though this again is old fashioned. The tie should be grey or a strong black-and-white design, either in a small pattern or stripes.
An old fashioned, though still elegant alternative is the Ascot tie. However, proper Ascot ties are as rare as hen’s teeth these days. Because day cravats are incorrectly called “Ascots” in American English, most of the time something is purported to be an “Ascot” it turns out to be nothing more than a day cravat, which is often made of lighter silks and without any interlining to give it formal structure.
This is an Ascot tie:

This is a day cravat:
These are two totally different garments. Please don’t get them confused. Pre-tied rental Ascot ties should be strictly avoided. The only way to get hold of a proper Ascot tie is to bespeak one of a good maker. Ascot ties are usually worn with a stand up collar, and finished off with a cravat pin. This is how they are tied:

Here is Sir Anthony Eden getting married wearing an Ascot tie and a winged collar:

Notice the step lapels on his coat.
Bow ties are another old-fashioned alternative. I see no reason why they should not be considered a valid modern alternative, even if it may be seen as being a little eccentric. The designs should again be grey or a black-and-white small design or stripes.
With any sort of neckwear, if colour is introduced to the waistcoat, the neckwear should become plainer by way of balance. If colour is to be introduced, it should be done so very discretely. Busy and colourful silk designs tend to ruin the understated masculine elegance of morning dress.
Footwear
There are two types of Oxford shoes that are classically worn. These are plain black calf skin Oxford shoes with a plain toe cap, or punch caps (a single row of punching across the caps).
Plain cap toe Oxfords:

Punch caps:

However, a number of small variations are permissible. The following are a couple of such examples.
This is a plain toed Oxford (there is no toe cap) with a medallion:

Next, is a type of Oxford known as an Adelaide, with the typical U shaped row of punching around the laces:

All of the above Oxford shoes are bespoke shoes made by Koji Suzuki.
Alternatively, dress boots with contrasting tops (cloth is traditional and more comfortable) such as button boots and Oxford boots are also very traditional, if old fashioned. The uppers are traditionally made of grey or tan cloth.
Galosh lace up Oxford boots:

Button boots from Parisian bootmaker Dimitri Gomez:

Spats were only fashionable for a limited period of time. They represent a fleeting fashion in the history of morning dress, and were often thought affected. Wear them only if you really want a vintage feel to the wedding attire. Galosh Oxfords with light coloured contrasting uppers also tend to look like spats. The disadvantage is that they tend to disrupt the continuity from trouser hem to shoe and make the legs looks a little shorter. This should be kept in mind when ordering such boots.
Socks
Silk or cashmere is traditional. However, many modern ultrafine cotton, or even wool socks can be just as elegant. The colour should be black, or dark grey with a subtle self-pattern. If cloth topped boots are worn, the socks should match the colour of the uppers. The socks should preferably be knee length.
Hat
Black silk top hat. A light grey Ascot shaped topper may be worn in summer with a light grey morning suit.
The top hat should be non-collapsible. Collapsible toppers (called a chapeau claque in Europe) are for evening dress only. The silk used for top hats is not longer made and the looms were destroyed. If a proper vintage silk topper is unavailable (restored vintage ones can be expensive) then a well made felt top hat is acceptable.
Gloves
Should match other accessories. Usual colours include white, pale yellow, biscuit, or shades of grey suede. The Count D'Orsay is described as wearing lemon chamois gloves and these can still be purchased from Pickett in Burlington Arcade, London. Gloves should be bespoke so as to fit smartly and discretely rather than being baggy like workman's safety gloves. Black gloves should be avoided.
Boutonniere
A small white flower should be chosen. The flower should be passed through the button hole of the lapel. Better coats also have a boutonniere loop behind them so as to hold the flower secure.
If a flower (or worse still a busy bouquet with stems, leaves etc) is pinned onto the coat, it is a dead give away that the coat is a cheap rental garment, where the coat has a sham lapel buttonhole that will not permit a flower to be passed through it.
Handkerchief
A coat with a chest pocket should be finished with a white handkerchief of linen.
Watch
The best option is to have a watch chain of gold or silver and a pocket watch - preferably heirloom or vintage:

Count D'Orsay is said to have worn "yards and yards" of gold chain. The best type of chain is a double-ended Albert chain. One end takes the watch, and the other end takes a fob. The two ends are placed in the pockets to the left and right of the waistcoat. The waistcoat may have a special fob hole designed to take a fob chain.


On a double-breasted waistcoat it may be worn like this if the tailor has provided you the proper fob hole in the middle:

Notice the extra shield shaped fob in the middle of the Albert chain.
If you really must wear a wristwatch then make sure it is a dress watch and not a sports watch (eg diver's watch, chronograph etc). Dress watches have plain indices or Roman numerals, and are discrete in size rather than the busy oversized monsters currently fashionable. They may have a small seconds, but not a large second's hand. The face should be white. The band should be black leather and not brown or metal. The colour of the metal should preferably match that of the watch chain and cuff links. Here are some examples of classical dress watches:


Overcoat
If worn, this should be a Chesterfield overcoat in navy, dark grey or black. A Chesterfield may be single breasted with concealed buttonholes or double breasted, like this example:

For more on the Chesterfield see this thread:
http://www.cutterandtailor.com/forum/index.php?showtopic=61
A rather old fashioned alternative for fanatics is the Albert top frock. For more on this garment see this thread:
http://www.cutterandtailor.com/forum/index.php?showtopic=47
Bibliography
Devereaux: Etiquette for Men, London, 1929
Barney, S: Clothes and the Man, London, 1951
Storey, Nicholas: History of Men's Fashion, Barnsley, 2008
Whife (ed) The Modern Tailor Outfitter and Clothier, London, 1949

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