Get the dress size below what you usually wear. I bounce back and forth between a Medium and Large, and this dress fit me perfectly in a size small. The color is gorgeous and the lacey fabric was semi-formal. I got a few people asking if I'd lost weight because it slims your waist. The only con to this dress is that under the lace there is a slip dress to cover your skin, but the bust area kept slipping down, even though my bust is definitely not a typical size small bust.