I bought my 13 year old girl a jumper dress, which isn't too short black and grey with a black and white line down the sleeve it looks best with bare legs but she doesn't want to show off her legs even though she has great legs however she does suffer with stretch marks EVEN THOUGH SHE IS THIN i think it's her confidence but she said she feels bare without anything on her legs she won't wear shorts without tights i don't know what to do!!!