Fast-growing, fast-fashion retailer H&M, which has more than 4,000 stores in 62 countries, sold $24.5bn worth of T-shirts, pants, jackets, and dresses last year. It also took 12,000 tons of clothes back. In a glossy, celebrity-studded video, H&M says: “There are no rules in fashion but one: Recycle your clothes.” Recycling has become a rallying cry in the apparel industry, with H&M as its most vocal evangelist. The Swedish firm launched a €1m contest to…