You'd need to be around 13 stone I think at that height, not accounting for massive boobs or hips or anything. I'm 5ft 8 and a size 18 around the hips but wear a 14/16 on top. I weight 13st 61b. 5'8". Size 16 ( can just squeeze into size 14 jeans on a good day)and 14 stone. vdSy.