I know, I feel like victoria's secrets is letting me down too >_< I've work mediums. I lift and have thick legs and trunks. Im built like a dwarf at 5'1" and 120lbs. I was always a medium but the last set of undies keep kind of sliding down if I walk around in a loose skirt. (I.e., they have to stay up on their own power)  Wtf. I'm more concerned with the I was always medium and treat myself to cute undies once a year or so and it got bigger in the time. Maybe it's just that style or something. But they might be caving.