Personalized Little Brother Comic Book Youth Long Sleeve T-Shirt. Little Brother! Pow! Cool! A little brother is like a superhero, not just a sidekick. Cute Youth Long Sleeve T-Shirt - White for any little brother! youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)