I'm 5'5", 36B, 33" Waist and 42" Hips and I got a Large and it fits fine. Tight on the body. The boob area though is pretty big. I'm still going to try to wear it because it's really cute but definitely it's large in the chest area.

I had to size up to a XL because of my breast size, and it still did not provide coverage or support for my breast. To sum up the dress was a XL but the Breast area A L