Polka dot bikini

This says it is a size 2X but from looking at it and measuring it, there is absolutely no way. Never tried on, just held up to other suits I own and this is a size large or maybe an extra large. Obviously it is stretchy but there is no way it would fit my butt! Navy blue with cheerful red polka dots and red ties for around the back and neck. The ruched sides on the bottom will give a flattering look. More of a retro/pin up vibe.