Big Sister Tshirt for Girls Sibling Shirt Gift Idea Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 50% Cotton, 50% Polyester Imported Machine wash cold with like colors, dry low heat Perfect for a Pregnancy announcement Tshirt. Big Sister Little Sister tshirt. Perfect for sibling photo session. Big Sister Shirt for pictures Lightweight, Classic fit, Double-needle sleeve and bottom hem