Der Fürst von Pappenheim (1927)

Because she has fallen in love with an unknown man, young princess Antoinette has fled to Berlin before her planned marriage with a prince. Incognito, she works for the fashion house Pappenheim, where salesman Egon Fürst falls for the young girl. Antoinette′s rigid uncle is sent to bring the royal runaway home, but he mistakes another mannequin for his niece, therefore taking the wrong girl to his castle in Baden-Baden. The whole Pappenheim company, including the princess, also goes to Baden-Baden for a fashion show, which means even more excitement and confusion.