Personalized 7th Birthday Rainbow Youth Long Sleeve T-Shirt. 7th Birthday Rainbow Youth Long Sleeve T-Shirt - Vintage Black has cute pink number 7 with clouds, hearts and rainbow logo you can personalize for a girls bday gift. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)