For reference I'm 5 foot 7 and 170 lb.  I was between ordering a medium and a large. I ended up going with a medium based on other reviews and it fit fine. Though it was a few inches shorter than I'd hoped. It tends to ride up as well. Perhaps if I had gotten a large it would have fit looser and hung lower. The zipper seems like poor quality and got stuck when I pulled it all the way open. However I can slide the dress over my head without using the zipper. A couple places I noticed loose threads where some sequins are either missing or where I properly sound down. But so far nothing additional has fallen off. I love the design and if I was shorter I think I would like the cut better.
I'm using this as part of a costume for 1920s Thor LOL