International fashion giants are rapidly phasing out virgin polyester, shifting to GRS-certified recycled fabrics. China's supply chain is responding swiftly: factories in Jiangsu and Zhejiang now produce down-proof fabrics from recycled PET bottles, supplied to leading North American down jacket brands. Companies like Kunshan Yongquan report recycled polyester orders have grown from 10% to 35% of their portfolio, boosting profit margins by 5–8 percentage points.