Wallflower (1948) Robert Hutton, Joyce Reynolds, Janis Paige

Joy (Janis Paige) is used to getting male attention, while her stepsister, Jackie (Joyce Reynolds), stands on the sidelines. The pair, who have a strong bond, come home from college and meet the handsome Warren (Robert Hutton) at a dance. Despite initially being attracted to Jackie, those feelings are instantly forgotten when he meets Joy. The two sisters vie for his attention, and Jackie decides to undergo a makeover in order to gain his affections. Her makeover has surprising consequences.