This dress fits very snug in the chest. For reference my measurements are 34AA, 24" waist, 35.5" hips. The elastic band underneath the bust rode up and cut off my boobs. Even if I pulled it down (empire waist) it left a mark on my ribcage after only a few minutes of wearing. This is definitely a dress you need to try on first--though I don't think this will fit anyone with more than an A cup in any of the sizes. I think the medium will fit me fine.