My eight year old is very lean, blessed with paternal metabolism and lacking hindquarters. Unfortunately, it's difficult to find pants that are long enough and have a skinny enough waist to fit, especially with his recent complaint that the adjustable waist buttons are causing him pain (although I think that's more to do with has to do with the elastic than with the button itself). . ). I actually ordered these pants for his Halloween costume (link from The Legend of Zelda) and when we tried…