Boireau et la gigolette.

Andre Deed sees Valentina Frascaroli shoot a man who annoys her in the street and is enchanted. He decides the way to win her affection is to swap clothes with the guy who cleans his apartment, and swagger about the cheap Montmartre saloons. Miss Frascaroli likes it, but the apaches who make up her friends don't, and proceed to torment the lovestruck fellow.