Textile waste is an urgent global problem, with only 12% recycled worldwide, according to fashion sustainability nonprofit Ellen MacArthur Foundation. Even less – only 1% – are castoff clothes recycled into new garments; the majority is used for low-value items like insulation or mattress stuffing. Nowhere is the problem more pressing than in China, the world’s largest textile producer and consumer, where more than 26 million tons of clothes are thrown away each year, according to government statistics. Most of it ends up in landfills.