I am 5’9”, 145lbs and ordered a size 8. It’s phenomenal in both the fit and quality. It bought it as the base layer of my bridal ensemble but it could easily be worn more casual as well. The fabric is beautiful! This was my first purchase from Black Halo and I’m so pleased. This is the first review I’ve ever taken the time to write if that tells you something!! It’s a great jumpsuit!