Depending on the maker/model/style of underwear, I wear either a size medium or large. I bought one pair of these in medium at the local Walmart. It fit, but after one wear there were horizontal runs in the fabric, starting at the seam of the front panel, going sideways towards the hips. It looked like some copper-colored thread in the fabric started fraying. So I bought size 2XL online. The leg openings for this size was a just little too big for me, other than that the fit seemed fine. However, after wearing the panties one time, the same horizontal runs started to appear. This is a "control" garment, so the fit should be just a bit snug vs. loose. But this underwear does not stand up to that. Maybe it would help if instead of just having one seam where the front control panel meets the rest of the panty, if the manufacturer would allow a little bit more of the fabric to overlap and do two parallel seams.