Personalized So Cute Prince Long Sleeve T-Shirt. Long Sleeve T-Shirt - White with a blue crown says I'M SO CUTE I MUST BE A PRINCE! Perfect for a royal baby boy. 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