Personalized My first St Patrick's Day Baby's First St Patricks T-Shirt. Ideal for photos, family gatherings, or simply dressing up your baby for the occasion, this outfit is a delightful addition to your child's wardrobe. Create lasting memories and celebrate the luck of the Irish with this must-have piece for your baby's first St. Patrick's Day! 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.