Personalized Halloween Outfit Baby Boy Long Sleeve T-Shirt. Cute babys first Halloween costume idea Long Sleeve T-Shirt - White with pumpkin hat on a happy smiling baby. 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