Personalized Baby's First My First St Patrick's Day T-Shirt. Whether you're attending a parade or enjoying a family gathering, this special outfit is a must-have for your baby's wardrobe. Create lasting memories and celebrate this special occasion in style with our "My First St. Patrick's Day" apparel. 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.