I typically wear a medium in everything-- shirts, pants, sports bras, bralettes etc. Based off the reviews and sizing chart, I ordered a medium. However, I have small breasts (34AA-34A depending on where I buy my bras). From the waist down the suit fit perfectly (I wear typically size 6 pants/jeans). There was substantial gaping and room around my breasts, making the suit straps fall down my shoulders, almost making it slip off. I was considering keeping it, but it would mean constant readjusting. It is too bad-- the suit is great quality for the price and I love the open back. Had to return. I bet this would look great on people with larger chests than me!! I would recommend this bathing suit if that is the case.