I bought these mostly so my thighs wouldnt chafe in a dress (totally works for that) but also to smooth out my underwear lines (thanks extra fat for making my underwear not fit as well) and support my belly. Now that Im 8.5 months pregnant I ONLY wear dresses so Im wearing this everyday (I bought two to rotate). I highly recommend these!

Also, Im 57 with a prepregnancy weight of 140lbs and 8.5 month pregnant weight of 181 lbs and the medium has worked for me.