I would recommend sizing up as I'm usually a 4 but could barely fit the 6 around my hip area.
Also, the dress was way too long so I don't suggest it if you are 5'3 and under. I wish they had a petite version of the dress as I really liked it otherwise.
Rated 5 out of 5
Rated 4 out of 5
Rated -1 on a scale of minus 2 to 2, where minus 2 is Runs Small, 0 is True to Size and 2 is Runs Large