Personalized Colorguard Youth Long Sleeve T-Shirt. Colorguard text with a flag taking the place of the letter L is a fun colorguard gift design for back to school, birthdays, holidays marching band and winter guard season. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)