The invitation had a gold skeleton key tied on with ribbon. So Daniel Roseberry was planning a seduction. The designer of Schiaparelli, whose work gets better and better, brought his audience on to the cellar of a Rothschild mansion — probably its former kitchens — and turned out the lights. That is, he blackened the room to suggest darkness and mystery. Then, evoking a Degas scene, he used a trio of chandeliers...