Personalized My first St Patrick's Day T-Shirt. Ideal for family gatherings, photoshoots, or just a fun day out, this St. Patrick's Day outfit is a must-have for your baby's wardrobe. Create lasting memories and share the joy of the holiday with this charming piece. 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.