Personalized 21st Wedding Anniversary Happily Married 21 Years Ago T-Shirt. Celebrate your anniversary in style with 21st Wedding Anniversary Happily Married 21 Years Ago apparel and gifts. Show your love and commitment to each other with these beautiful and unique items. Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.