I'm a 172cm tall transfemme, and usually wear a US 18-20 dress so I got a 2x Regular. It hugs my boyish shoulders much better than the Tauriel overdress does, and is the PERFECT length to gently waft along the floor in only my socks. I do need to be careful when getting up from a chair or if I bend over because I might step on the hem. I also think I need to buy the specific chemise for it, because my wife thinks the sleeves on the Tauriel chemise are ridiculous but I love 'em. My wife likes it on me more than the Tauriel overdress too. Might simply be because it's not black-on-black though. AND IT HAS POCKETS!!!
Regular / 2X / Deadly Nightshade