Personalized Faux Rhinestone 21st Birthday Long Sleeve T-Shirt. 21st birthday Long Sleeve T-Shirt - White with a shimmering, glittering, sparkling, silver, FAUX rhinestone number 21. Perfect for her 21st 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