Personalized St Patricks Day Luck T-Shirt. St. Patrick's Day Shamrock T-Shirt - White has a row of lucky four leaf clovers and room to add a name or St Paddys Day slogan. 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.