Personalized Pirate 1st Birthday T-Shirt. Ahoy, Mateys! A pirate alligator and his parrot friend have found a birthday treasure chest full of gold, jewels, and cake! Cute 1st birthday gift for the one year old! Everyone loves our Custom T-Shirts! 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.