Jane Steps Out (1938)

Wallflower Jane Wilton has always lived in the shadow of her beautiful and popular sister Beatrice. Making things worse, Beatrice is spiteful and cruel, directing all manner of nastiness towards the submissive and uncomplaining Jane. But when Beatrice sets her cap for Jane's erstwhile boy friend Basil Gilbert, she goes a shade too far. For once, the worm turns, and Jane fights tooth and nail to win her man back. A retelling of the Cinderella story.