What kind of fabric can be both synthetic and natural?

Chiffon is a lightweight, sheer fabric characterized by its delicate and flowing nature. It can be made from both synthetic fibers, such as polyester, and natural fibers, such as silk. This versatility in fabric composition allows for a range of applications in fashion, from elegant evening wear to casual attire. The ability to create chiffon from both types of fibers makes it unique compared to the other options listed.

Cotton is a natural fiber, primarily derived from the cotton plant, and does not have a synthetic counterpart. Polyester is wholly synthetic, made from petrochemical products, and does not have a natural form. Denim, typically made from cotton, is also a natural fabric and does not encompass synthetic variations in its common usage. Therefore, chiffon stands out as the fabric that can originate from both synthetic and natural sources, making it the accurate choice for this question.