Personalized 15th Birthday Party Gift Women's T-Shirt. 15th Birthday Party Women's T-Shirt - White has a unique and colorful balloon and stars logo in rainbow lettering with Party - 15 Rocks bday slogan. Get ready to celebrate in style. Classic ladies' styling with a feminine neckline, sleeves and fit. 5.0 oz., pre-shrunk 100% cotton. Double-needle stitching throughout