Personalized My first St Patrick's Day Baby's First St Patricks T-Shirt. Whether for a family gathering or a festive outing, this apparel is sure to bring joy and smiles, making it a must-have addition to your baby's 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.