Personalized 3rd Birthday Koala 3 Year Old Long Sleeve T-Shirt. Three year old birthday party for girl or boy with bear in a beach floaty. 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