The ay I make money is selling Tall Tee's at my school. And from experience I really like Finish Line tall tee's. They stay soft and are always long.....So keep that in mind. And also if you are really gonna go for the tall tee look, dont go half-ass and produce some fat t shirt. Skiinny and long.
Also Neon would be dope.
Have some creative NS users come up with some fresh Line Neon Colorful Logos and shit.