Personalized Number One Teacher Youth Long Sleeve T-Shirt. Cute Number One Teacher apple logo school Youth Long Sleeve T-Shirt - Heather gift for the best teacher you know. Add their name or class year below the design when you order. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)