Definitely do not size up, get your size. I sized up to a medium and it’s very unflattering on. The dress contains a lot of stretch, and the snap buttons somehow hold the dress closed decently while not feeling like they have a super secure snap.

Fits a little too big for my liking. I am 5'1, 143lbs, 34DDD, 27 waist, 41 hips. I got a size small. I wish it came in extra small. You can size down.