Personalized Shamrock Irish Flag Long Sleeve T-Shirt. This colorful Irish flag logo with green shamrock clover is a lovely gift for any Irish friend for St. Patrick's Day. It comes on a holiday Long Sleeve T-Shirt - White. 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