These belts have 5 sets of holes spaced 2" apart so they are versatile; you can wear the same belt on your waist or hips. They also stretch slightly, like a pair of jeans, and will conform to your body after a few days of wear.
Small fits most sizes 0-4 (measures 35" long, holes are between 23" and 31")
Medium fits most sizes 6-14 (measures 41" long, holes are between 28" and 37")
Large fits most sizes 14-20 (measures 47" long, holes are between 34" and 43")