"There is a lot of romance surrounding the art of making clothing by hand and I feel that a lot of the techniques have been mythologized beyond what they should be, mainly repeated received wisdom without challenging the [shibboleths] of 100 years ago. Such myths as seams having to be done by hand in order to give them elasticity of which a machine is not capable, to which I ask, if a machine is not capable of producing a seam with elasticity, then are bathing suits, underwear and athletic wear all sewn by hand? Or perhaps that a hand-sewn seam will mold to the body in a way a machine-sewn seam can not. It is said that hand tailoring is just better than machine sewing. This is often part of a marketing spiel designed to sell you an expensive product."
Then the author, Jeffery Diduch, was give a shirt to examine by the Netherlands company 100 Hands.
"This shirt truly is hand made. Certain seams which require strength have been sewn by machine using impossibly tiny stitches, but practically everything else has been done by hand. While many hand finished shirts I have seen use longer, lighter stitches usually out of expediency, those stitches are often delicate and do not withstand the kind of abuse to which a shirt is often subjected. In this case, however, the sewing is astonishing, both in the density of the stitches which make for a far more durable garment, as for their evenness and regularity."
Lots more on the site.