The film is about the Windmill Theatre, a legendary London vaudeville theater from the World War II era. Under British law the girls had to stand perfectly still while they were nude on stage. There are one or two great scenes where the girls are on stage when the Germans attack London, and the terrified girls have to stand on stage naked and still while bombs are dropping around the theater. The trailer is here:
http://www.youtube.com/watch?v=nhMZPhNUk20 (only very, very brief flashes of nudity)