I Love Lucy (1951)

S3E7 The French Revue

Ricky is organizing a French revue for the club, but Lucy is eager to participate. To prepare, she enlists the help of a Frenchman for coaching. When Ricky tells her she can't get involved, Lucy resorts to a series of disguises. Ultimately, she manages to sneak in as a chorus girl, determined to be part of the show.