@ai6yr@m.ai6yr.org I have done quite a few waist alterations for clients, to men's trousers. It is only worth it if the center back seam has a good-sized seam allowance and a flat seam; which is more often found in good quality suit trousers. For garments with topstitching and multiple layer seams, it is not worth it. In that case, buy to fit your torso and alter/ cut off the legs. You can always add gussets to the legs, if you feel creative. That is how people altered jeans to be bell-bottoms in the early 1970s.