Personalized Las Vegas 21st Birthday Women's V-Neck T-Shirt. 21st birthday Women's V-Neck T-Shirt - Black with Las Vegas welcome sign that says IT'S MY FABULOUS TWENTY-FIRST BIRTHDAY. Fun and unique for her very special birthday. 5.0 oz., 100% pre-shrunk cotton Athletic Heather is 90/10 cotton/polyester 1x1 rib collar with mitered v-neck Shoulder-to-shoulder taping Ladies' fit