According to their measurements, I needed an XXL, which I would say is a dress size 10. It fit perfectly, but I realized not for a corset. The ribbons were as tight as they could be, and the squeeze was just barely. So I ordered an XL instead, I'd say more like a size 6-8. If you're looking to reduce stomach bulge, this is what you'll want to do. The XL gives more squeeze and therefore shape, but note, the ribbons will look looser but that's what the back fabric is for. So I suppose it depends on what you're getting it for, but for me, one size smaller was a better choice as exact size measurements offered no option to go tighter. I feel like it's well made and will last. It fits well under clothing too. If you're busty, it does offer some support.