Karan, who pretty much ruled Seventh Avenue in the 1990s, is exec producing Mister Halston, a new play about her old pal Halston, the swashbuckling Studio 54 habitué whose spectacular rise and even more spectacular fall is getting the stage treatment for the first time. “I saw a workshop staging of Mister Halston last summer at Bay Street Theater and liked it so much, I wanted to get involved,” Karan, 77, tells Rambling. The world premiere runs June 2-21 at Sag Harbor’s Bay Street Theater, which is, of course, practically in Karan’s backyard.
