Personalized Happy 7th Birthday 7 Year Old Monster Women's V-Neck T-Shirt. Childs 7 year old birthday design with balloon and monster on a Women's V-Neck T-Shirt - Aqua 7th birthday outfit 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