Personalized Little Sister Unicorn Toddler T-Shirt. Little Sister Unicorn - A cute little sister unicorn prances with a heart on her cheek in a rainbow filled sky. Cute gift for any little sis! A toddler-soft cotton tee in look-at-me, big kid colors. 4.5 oz., 100% combed ringspun cotton. White is sewn with 100% cotton thread. Topstitched rib crew neck. Double-needle stitched sleeves and bottom hem. Shoulder-to-shoulder taping.