I usually order M when there is stretch, but when there is no stretch, I know I fit a large better. So, I was real with myself and got a large. It fits perfectly and it is stunningly BEAUTIFUL!! My waist is about a 31. I'm about 154 lbs & 5'5. I don't have a lot of boobs... I dont have a big butt either, but the dress kinda poofs out - so if you were blessed in the lower region, no worries! It should fit. If you have large breasts, though, you probably will need XL. Fun note: If this dress came in white, it would be a a dope reception dress for a bride. I LOVE IT SO MUCH.