Personalized Mermaid Princess 6th Birthday Women's Plus Size T-Shirt. 6th birthday Women's Plus Size T-Shirt - White with a beautiful little mermaid princess wearing a crown atop her red flowing hair and surrounded by cute fish and starfish. Text says THIS LITTLE PRINCESS IS 6. 100% combed ringspun cotton premium jersey (CVC Colors are 60/40 combed ringspun cotton/polyester)