Personalized Shamrock Clover Irish St Patricks Day Long Sleeve T-Shirt. Very Green Shamrock Irish Long Sleeve T-Shirt - White is perfect for a St. Patrick's Day gift. 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