I'm a US size 16 (sometimes 18 depending on the cut) and bought 2XL. It fits perfectly! First, it's a thicker, stretchy material that's just amazing. It washes well (cold water, medium-low dry) and stays nice and comfortable all night. I bought this dress to wear to a 1940's style wedding and I have had so many compliments on this dress that I will definitely find reasons to wear it again! The only two things that detract from that, and they're so small that they don't really matter, but just worth mentioning are: I felt the arms were a little tight, but not very tight. and there is a seam at the very front center of the skirt which I found a bit odd. All in all the dress is a big win and therefore worth buying. I have attached a photo.
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