This stunning dress is so formfitting and a gorgeous color. The waist is corset type with boning. Has a back zipper, so it’s not a true corset, but hugs you like a corset to make your waist really small. And accentuate your curves. Wore one time for an event in perfect condition. When I purchased, I had to choose a bra cup size which is A to C. I’m a Cup and size 1 or XS/S