Personalized Daddy's Lucky Charm T-Shirt. Celebrate St. Patrick's Day with this charming shamrock design on your T-Shirt - White. Perfect for bringing a touch of luck and festive spirit to your wardrobe. Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.