This fits up to a 38/40 DDD comfortably in the XL. It's not a lot of support, but it's much better than being braless. Expect the support of a shelf bra. The clear plastic back strap, and interchangeable straps, are reasonably comfortable, and will hide well under costumes. I wish this came in a plus size with a bit more support, but it's the best dance bra I've ever had.