The French designer was synonymous with striped sweaters and Left Bank insouciance.
The music star had launched the collection last February during New York Fashion Week.
Cuts may be coming to Condé Nast.
The executive, who has been with the firm for 14 years, has been named executive vice president of the division.
On Thursday, a day after she was named editor of WSJ. magazine, Kristina O’Neill attended the magazine’s flagship shindig.