Great way to support your older brother or sister. Perfect gift for a new little sister. Wear this to the game and cheer on your older sibling. Little Sister and Biggest Fan Baseball Glove and Bat Toddler T-Shirt. Solid color tees are 100% cotton, other are a cotton/polyester Blend. Little Sister and Biggest Fan Baseball Glove and Bat Toddler T-Shirt. Wear this to the game and cheer on your older sibling.