Actors Dieter Borsche and Georg Thomalla (center and right) femulating in Fanfaren der Liebe (Fanfares of Love), a 1951 West German film in which "two out of work musicians put on drag to get work in an all girl band. Inevitable comical romantic complications ensue," (according to IMDB).
Fanfares is the film that Billy Wilder used as a model for his 1959 classic comedy Some Like It Hot. It was such a big hit that there was a sequel in 1953 titled Fanfaren der Ehe (Fanfare of Marriage). In the sequel, the musicians married two female musicians they met in the earlier film. When the females get work on a cruise ship, their husbands dress as women in order to join them.
By the way, Fanfaren der Liebe was based on a 1935 French film, Fanfare d'Amour (Fanfare of Love), with a similar plot.