So I bought the 16, even though Im more of an 18, but the measurements were close and Im losing weight so I took a risk. I assumed that there was a lot of stretch, but there is only a little bit of stretch, so it does fit pretty tightly.  But that being said, I threw on some spanx, and i still think the dress is flattering to a girl with curves.  Im around 57, 245. My measurements are bust 42, waist 36, hips 47.  To give perspective Ill post pictures.