Personalized Stick Girl Future Big Sister Long Sleeve T-Shirt. Future big sister Long Sleeve T-Shirt - White with a cute cartoon stick girl waving her arms and big pink heart. She says I'M GOING TO BE A 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