Personalized North Pole 1st Birthday Women's Plus Size T-Shirt. Women's Plus Size T-Shirt - White for a little elf's 1st birthday with a polka dotted number one and red and white striped North Pole sign. Perfect for Santa's helper on his or her Christmas birthday. 100% combed ringspun cotton premium jersey (CVC Colors are 60/40 combed ringspun cotton/polyester)