in this point in my life, i wear mostly tee's that are way to big on me, usually tall tee's, i hate when you get an XL and it's short but mad wide, so tall tee's are deff the way to go. I'm sure many, many kids would be interested in slim fit tee's seeing as at my private school i go to, almost every single kid wears a slim fit tight as hell tee. So i think you'd do fine selling a slim fit