Task: Explanation
Input (English): Bruce Weber (born March 29, 1946) is an American fashion photographer and occasional filmmaker. He is most widely known for his ad campaigns for Calvin Klein, Ralph Lauren, Pirelli, Abercrombie & Fitch, Revlon, and Gianni Versace, as well as his work for "Vogue", "GQ", "Vanity Fair", "Elle", "Life", "Interview", and "Rolling Stone" magazines. Question: Bruce Weber is most widely known for his ad campaign for what American retailer that focuses on upscale casual wear? Answer: Abercrombie & Fitch
Output (English):  He is most widely known for his ad campaigns for Calvin Klein, Ralph Lauren, Pirelli, Abercrombie  Fitch, Revlon, and Gianni Versace, as well as his work for Vogue, GQ, Vanity Fair, Elle, Life, Interview, and Rolling Stone magazines.