Personalized Pirate 4th Birthday Youth T-Shirt. Ahoy, Mateys! A pirate alligator and his parrot friend have found a birthday treasure chest full of gold, jewels, and cake! Cute 4th birthday gift for the four year old! Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.