I’m typically a Medium. The costume does fit a little off, the bottoms are super tight on me and the clasp does not reach, if I pull it down enough for it to clasp correctly my entire boobs are out, therefore I do have to get a lot of alterations, additionally I am a B cup and if I raise my hands my boobs are fully exposed. I’m a little disappointed, it looks extremely worth the money on the model. I would look for another option, save the money.