It’s one big game of revolving doors in the fashion houses. Olivier Theyskens didn’t even have time to sign on to the dole after Rochas closed their prêt-à-porter line, already he’s landed the top post at Nina Ricci. How the 29-year-old Belgian’s sombre world will match the romantic mood at Nina Ricci is not immediately apparent, but he’ll definitely rejuvenate the ailing old lady. The post was left open when Lars Nilsson bowed out for pastures new. We hear he is moving to Oscar de la Renta.