When I ordered it there was only xs and L so I went with large thinking I can always tighten it and it worked! I got a ton of compliments on it and my friend borrowed it for another dance. 100% recommend!! By the way I'm usually a size medium in shirts and 5 in jeans! (34C and weigh 130 lbs) Also I wore sticky boons at first, but I danced a lot so it literally sweated off within 15 minutes so I just took it off and you couldn't notice at all! My friend wore a white bralette and it was super cute too!