I ordered a size 2, & 0 - I went with the 2 and it fit perfectly! I got so many compliments on this dress. It's difficult for me to find strapless dresses that I don't have to pull up all evening and this one was great. There are elastic strips on the sides, toward the back for extra comfort and support - I'm 5'8" but a 30D (small ribcage). I would rent this dress or buy it if I could!