The Lady Eve (1941)

Henry Fonda, Barbara Stanwyck, Suzanne Ridgeway, William Demarest

Returning from a year up the Amazon studying snakes, the rich but unsophisticated Charles Pike meets con-artist Jean Harrington on a ship. They fall in love, but a misunderstanding causes them to split on bad terms. To get back at him, Jean disguises herself as an English lady, and comes back to tea