Happy New Year!
I hope 2018 is a wonderful for one for you, and your family!
I ordered this dress is size large, which is much larger than my usual small in U.S. sizing. Just pay close attention to the measurements and you should be fine when ordering. Even with ordering a large, there was no room to spare, this dress fit me like a glove. The fabric has a little give, so it was still comfortable, and for this club style dress, I think very fitted is a good look, anyway. The main thing I would change are the adjustable straps...they tended to become twisted.