The waist is too big in every pair of ladies pants I buy. Most of the pants do not have a centerback seam for alteration. I tried to cut through the waistband and then take the material in by gradually tapering from just above the hips to the waistband. When I do this, it looks fine. BUT when I try this on, there is a bulge just below the waistband. What am I doing wrong or is there an easier way. Thanks so much.