The Mad Night (1932)

Antoine, is the brother of Clothilde, lady-in-waiting to gorgeous duchess Silvéri. Parzy falls in love with the duchess, but can't get anywhere near her thanks to the vigilance of the girl's duenna. In desperation, Parzy disguises himself in his sister's clothes and poses as a girl. This gains him entrance to the duchess' boudoir -- but now what does he do?