Size 0-2. The tag size is O, but the corset back allows for adjustable sizing. I usually wear a size 2 in Sherri Hill and the size 0 was perfect. This gown has a corset bodice with a bow and a cascading ruffle. The lace up back and the spaghetti straps give it a gorgeous look as well. We had to have this dress shipped 3 months in advance because it was unavailable in all states surround Arkansas. We paid $700 for it. Only worn for 4 hours.