Personalized White sousaphone only Youth Long Sleeve T-Shirt. Display your pride for your Sousaphone skills with this drawing on Youth Long Sleeve T-Shirt - Black in white. Also makes a unique gift for low brass musicians, music teachers and students at back to school, graduation, birthdays or holidays. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)