Easy, I read items run big on some reviews so I went with small for all of my items. They are very fitting, medium probably would have fit more comfortably. One outfit I gave to my daughter. I'm 5'2 and weigh 132lbs. I'm between a 2 and 4 which makes it difficult most ranges are from 0-2 and 4-6. So when I order the 4-6 items tend to be a bit too big on me. I either need to gain more weight or lose a little lol overall I really like the print, colors, material.