Personalized Me 1st St. Paddy's Day T-Shirt. 1st St. Patrick's Day T-Shirt - White with a cute baby wearing a diaper in a green T-shirt, holding a shamrock rattle. He says IT'S ME FIRST ST. PADDY'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.