From Elizabeth Taylor to Zendaya, Isaac Mizrahi has dressed them all. In his nearly two-hour cabaret, “Isaac Mizrahi: I Know Everybody,” the fashion designer and all-purpose entertainer sings, jokes, flirts, name-drops his celebrity Rolodex and more with the help of his jazz band.

Wearing all black with gold chains, red-and-black shoes, and a dramatic white rose pinned to his chest, Mizrahi tells the audience he’s aiming for “Claudia Schiffer for Chanel.” One Instagram commenter, however, saw “Barbara Bush,” a contrast that captures the show’s spirit. He may no longer be in his prime, and that’s the point. He’s in on the joke.

Mizrahi doesn’t hold back. Whether on Project Runway All Stars or onstage, he critiques, confesses and flirts without a filter. Early in the show, after warmly a

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