Personalized Lil Sis Unicorn Girls Sister T-Shirt. Lil Sis T-Shirt - White has adorable little girl unicorn and hearts for a new sister, a great gift idea for baby. Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.