Personalized Worlds Best Poppy Grandpa Long Sleeve T-Shirt. Worlds Best Poppy Long Sleeve T-Shirt - White gift for grandfather have World's Best Poppy blue and tan sports style logo. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL