Although he first gained fame as a fashion designer, Isaac Mizrahi had always harbored a desire to be involved in show business. So after Chanel (his backer) pulled the plug on the majority of his fashion empire in 1998, it comes as no surprise that he would reinvent himself as a performer and writer. Starring in the one-man cabaret act "Les MIZrahi" (2000), he reached a new audience.Born in Brooklyn, Isaac Mizrahi found his metier when he was a teenager, designing and making clothes for his mother and her friends. He simultaneously nurtured his love of theater, though, by attending the High