Ordered this on a whim - 32H, 5'5, usually a US size 8/10 with a tiny belly. This thing fit like a glove without emphasizing my stomach, and OMG THE BOOB SUPPORT. I've never worn a dress like this. Ordered to the US, and will definitely be ordering more. The fabric and it is unreal. I've never gotten to wear anything backless because there's typically no boob support, but that's not the case here. This dress is life changing. Size medium was perfect for me.