Personalized Monkey Big Sister Long Sleeve T-Shirt. Big sister Long Sleeve T-Shirt - White with adorable little girl monkey ballerina in a pink tutu and ballet slippers holding a bouquet of flowers says I'M THE BIG SISTER. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL