Personalized Saint Patrick's Day, Luck, Believing You're Lucky Long Sleeve T-Shirt. Cute, fun and adorable design with clovers and text 'Luck is believing you're lucky'. Modern and trendy gift, perfect for Saint Patrick's Day. 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