Personalized Babys 1st Christmas Santa Claus Long Sleeve T-Shirt. Santa Claus baby with it's my very 1st Christmas holiday slogan on a Long Sleeve T-Shirt - White outfit. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL