Gabriela Hearst's war on waste upends the fashion process

Buying up unused fabrics and repurposing old stock is part of the designer's sustainability mission

Gabriela Hearst, a favourite fashion designer of Oprah Winfrey and the Duchess of Sussex, describes her business model as "cooking with leftovers".

Cashmere leftovers, that is. With her husband, John Augustine Hearst, scion of the magazine empire, the fashion designer has a net worth estimated at 1.5bn, and has made it her mission to develop a sustainable methodology for the fashion industry.