I'm 5'3 a US size 16p/18p 39 waistline 49in hips. I purchased a size 18p and they fit perfectly. l could have ordered the 16p and would have been equally good in that size as well. the 18p is looser around the waistline and through the hips on me. I love the rhinestone butterfly on my bum, my spouse doesn't he says it brings attention to that area, he's just not in the eyeball sharing mood. lol