Personalized Little Sister, Younger Sister, Arrow, Sibling Youth Long Sleeve T-Shirt. Cute, fun and adorable design with arrow and text 'Little sister'. Modern and trendy gift, perfect for the little princess in your life. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)