Personalized Las Vegas 16th Birthday Long Sleeve T-Shirt. Las Vegas sign 16th birthday Long Sleeve T-Shirt - White says IT'S MY FABULOUS SWEET 16TH BIRTHDAY. 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