Two legends in the world of high fashion died late last week: photographer Horst P. Horst, 93, and the longtime editorial director for Conde Nast, Alexander J. Liberman, 87. The German-born Horst, who worked until 1991, photographed subjects as diverse as Coco Chanel, Harry Truman and Andy Warhol. He preferred to work in a studio, where lighting could be manipulated to glamorize his subjects. As for Lieberman, among the magazines he helped guide were Vogue, Mademoiselle and Glamour. With such powerhouse titles under his guidance, Liberman is credited with helping to shape what American women wore and how fashion journalists covered it.