Personalized Santa Hat Tuba Youth Long Sleeve T-Shirt. A sousaphone wearing a Santa cap is a funny gift design for tuba musicians, music teachers and students in tuba choir, concert and marching bands at Christmas and the winter holidays. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)