Loulou de la Falaise

Loulou de la Falaise, who died on Nov. 5 at 63, was born in postwar Sussex, England, to an aristocratic and fashionable French-English family and had little to do except get by. She did it with vigor. (She liked to say her mother baptized her with a dab of Schiaparelli perfume.) Widely known in the '70s as a muse of Yves Saint Laurent, the bohemian beauty came to oversee parts of his collection, providing hats, jewelry and, most of all, inspiration for his line. For a long time, she objected to the term muse, which she found dismissive; had she been...