I am pretty much a true medium in most clothing, but due to the size of my bust (34J), I typically size up in items that don't appear to have much stretch. I sized up to a large, but y'all, I can hardly breathe. An XL would likely fit much better, but I don't know if I want to deal with the hassle of returning and repurchasing. You have been forewarned, ladies! The dress is very cute, has a zipper, and isn't cheap looking, just make sure to play around with sizing.