Personalized My first St Patrick's Day T-Shirt. Ideal for gifting or as a special treat for your own baby, this outfit is a delightful way to introduce your child to the joy of St. Patrick's Day. Dress them up in style and let the festivities begin! 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.