Personalized Faux Rhinestone 21st Birthday Women's Plus Size T-Shirt. 21st birthday Women's Plus Size T-Shirt - Black with a shimmering, glittering, sparkling, silver, FAUX rhinestone number 21. Perfect for her 21st birthday! 100% combed ringspun cotton premium jersey (CVC Colors are 60/40 combed ringspun cotton/polyester)