A COSTUMED KARL: At Roberto Cavalli’s Halloween party at Cipriani 42 Wednesday night, one woman came as Josephine Baker in the famous banana skirt. Another came as Marie Antoinette. Julia Restoin Roitfeld was a leopard, Tinsley Mortimer was an angel and the designer himself showed up as Karl Lagerfeld. “I wanted to go as someone from the world of fashion,” he said with a shrug, after directing a slew of well-wishers to kiss his hand, on which he wore a copy of the French couturier’s fingerless glove. But if there’d been a prize for best costume, it would definitely have gone to Christine Schwarzman, the wife of private equity honcho Stephen Schwarzman. With her husband out of town on business, she came outfitted as Victoria Beckham, complete with a cardboard cutout of the former Spice Girl’s soccer-playing hubby. “I got it on the Internet for $70,” she said. “He’s really good in bed. Although it’s always vertical or horizontal with him.”

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