Hot for Polka Dots? Slip on this 50s style Bettie Bow Dress in Navy Blue with White Polka Dots. This Navy cotton sateen polka dot A-Line dress is unlined, had a hidden back zipper and a decorative bow at the neckline. Materials: 97% Cotton, 3% Spandex . This Junior Sized dress is true to size. Please refer to sizing chart. Only made in sizes S, M & L.