DEFINITELY size up for this dress. I tried it on in the fitting room and it took me about 7 minutes to take it off. Even on​,​ it did feel incredibly tight and uncomfortable. It highlighted my tummy pooch and wasn't the most flattering fit. In fact​,​ it was sufficiently tight that I felt like maybe sizing two sizes up would've been the right move. Otherwise it's probably a better silhouette for someone who is less curvy.＜abbr＞The Kooples​,​size S​,​​,​5'5-5'6 5'5-5'6​,​Size S The Kooples＜​/​abbr＞