I normally wear a size s and that is what I ordered and it fits good it isn't too tight at all I think a m would have been too loose. Got lots of compliments on this suit! Get to Know Us. I don't want it to be too much skin showing and the medium covers more than a cheeky thong. Wearing a microbikini bottom had a wider back to it, a little more coverage than a thong I'd say. See Wearing a microbikini bottom customer images.