Greenpeace has thrown down the gauntlet. In November, the environmental nonprofit presented 15 Italian and French fashion houses, including Chanel, Dolce & Gabbana, Gucci, and Prada, with 25 “uncomfortable” questions about their supply chains. Its goal? To determine where the luxury sector stands in terms of toxic water pollution and deforestation. The results, released on Thursday on a new “Fashion Duel” website, was a mixed bag. Valentino topped the ranking for its “ambitious and binding commitment” to eliminate all hazardous chemicals from its supply chain and products, while brands like Salvatore Ferragamo and Louis Vuitton received a poor to unsatisfactory grade for their “partial commitments” and “real lack of ambition,” says Greenpeace.