I have a couple of questions for you
-are these trousers made by a tailor or mad to measure ?, easy to tell. (If made to measure the fix is harder as no decent inlays)
- are they wool or cotton?( If cotton you cannot fix nicely)
- did you have a fitting? Bit more info needed around this.
The remedy for the trousers is very difficult once made up. The time to resolve this would have been during the fitting. The fact that you have two hip pockets only compounds the problem once the trouser is made
The old term is that you " stand on your trousers". It is not uncommon.
If this is another tailors work I am reticent to comment.
So here is hoping they are made to measure.
Big job, that is why fitting is the best time to sort out the balance of a trouser and you cannot completely rectify the problem but this is the only way to get close after the trouser is made.
1/ Undo the centre seat and waist seam
2/ Take the waistband off the back of the trouser to about 2 inches in front of the side seam
3/ Undo the side seam down past the pocket
4/ Undo the first six or so inches of the fork
1/ take in the side seam about 3/8 to o at level with base of the seat
2/ If you have 2 darts above each pocket as sometimes the case make the outside dart a "faux dart" like a pin tuck rather than a dart and adjust by taking in at the side seam and letting out in the seat
3 Let out the seat seam 6/8
4/ Let out the fork 3/8 plus
5/ at the side seam and the top of the back of the trouser o to the seat seam lower he band max of 3/8 as the pockets are in place and cannot be more.
Ideally on a tailored trouser you would lengthen the front rise 3/8. (Made to measure no inlay there.)
In pressing the trouser off shrink in the hams a little.
Bear in mind you have now straightened the trouser as this was the problem. The trouser was too crooked most likely. This is a fine balance as you may restrict movement on your stride when the trouser is too straight.
This is an alteration only and is no substitute for seeing a properly trained tailor ie one that has learned off another tailor and will have been taught this stuff on the way to becoming a cutter most likely
Hope that is of help
Preston and Maurice