Funny T Shirts - World's Okayest Sister Shirt Sibling Shirt 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 Funny sibling shirts - World's Okayest Sister shirt. Proudly show off that 2 and a half star sisterly rating with this World's Okayest Sister tshirt. World's Okayest Sister shirt features award-winning film style design. Be the okayest sibling you can be with this World's Okayest Sister tshirt. Lightweight, Classic fit, Double-needle sleeve and bottom hem