You can't. According to Sohu News, polyester filament and cotton yarn are two completely different textile raw materials. Polyester filament is made of polyester fiber, which has excellent strength, wear resistance and durability, and is often used to make clothes, home textiles and other products. Cotton yarn is a kind of yarn made of cotton and processed by spinning. It is soft, breathable and hygroscopic, and is often used in the production of textile fabrics. Therefore, polyester filament and cotton yarn have obvious differences in fiber raw materials and properties, and cannot be called the same yarn.