Personalized Its My 1st St Patricks Day Irish Clover T-Shirt. Cute green shamrock clovers to celebrate babys first St Paddy's Day come on a T-Shirt - Vintage Black holiday outfit 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.