I tried this on in my regular size and was able to get it on fine, but the cup portion of the suit was just crazy! with the straps tied tightly around my neck, it was like the cups just flipped out and open. i am a regular b cup, and i don;t think it was sizing (though i did not have the opportunity to try multiple sizes). the cup did not right and, for this reason, would make this absolutely impossible to wear. unfortunate, because the design is so pretty.