Bedding set: Get a seersucker duvet set with pillowcases. Textural bedding: Seersucker has a beautiful, comforting texture. Material: Made from 50% cotton and 50% polyester. Simplicity: Perfect to add style and simplicity to your room. With pillowcases: Get a single duvet set with one pillowcase, or a double or king size with two pillowcases each.