I ordered a size 6- it fits. But the thing is, its a little bigger on my boobs. Im a size B34. The arms are a little too tight but not bad where I need a bigger size. But the weird thing is I didnt feel the need to wear a bra with it. I was thinking I would have to find a bra that would work with this dress because of the boob part being a little bit bigger. I absolutely love this dress and I cant wait to wear it!