DNephew (14) has requested some Urban Outfitters clothes for this birthday - joggers or t-shirts. He's not bought anything from there before but according to DSis it's where all his friends are now buying their stuff. Issue is he's a small 14 - about 5'4 and skinny. Can anyone offer any guidance on how the XS/XXS sizes fit? Don't have a store near me - can get my DSis to do some measuring but wanted to get steer first on what we should be looking at.