Long before sustainability became a fashion industry buzzword, wool was being recycled in the hills of Prato, Italy. For over a century, craftspeople there have been transforming discarded wool garments into new fibres, a practice known locally as "carding" that turned necessity into an art form. What was once a way to make the most of scarce resources has become one of the most promising solutions to fashion's waste crisis. Recycled wool takes existing wool textiles—whether