Nearly a lady (1915)

Young Frederica Calhoun, naïve to the ways of the world, having grown up on her father’s Montana ranch, is swept off her feet by the arrival of Lord Cecil Grosvenor, a prospective buyer. He opens her eyes to a hitherto undreamed-of world of refinement and he by her unfailing sweet disposition and sunny bubbling good spirits. They are soon engaged, but during a trip to New York to visit his sister Frederica begins to let her doubts get the better of her and disguising herself as a man follows him to the French Ball, but all turns out well in the end.