Personalized Wee Bit O'Irish T-Shirt. Cute St. Patrick's Day T-Shirt - White with a cute smiling shamrock wearing a green derby says WEE BIT O' IRISH. Perfect for a 1st St. Patrick's Day. 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.