This is was really ehhh to me. For your reference, I am 5'4" and about 160 pounds. I got a medium. I have a 34DDD bust and the center of my waist measures 33 inches. My hips are 36 btw and I probably would have sized down if I could return it. The material is surprisingly thick and didn't fit me the way I wanted it to so it's going to be donated.

5'2; 140 or so; 34D; bought a small; Dress material is on the thicker side which is good because it was a Valentine's day dress. i feel like it may have been a small amount of extra space maybe near the waist but idk if i'm remembering it right.