Der Florentiner Hut (The Leghorn Hat), a 1939 German film directed by Wolfgang Liebeneiner

A young horse lover falls in love with the handsome vet who looks after a special racehorse. But before the two can be happy together, there are a lot of obstacles in their way.

Yvette is the daughter of a courtesan who serves men of wealth and status. She is unaware of how her mother makes money and why they are always in the presence of princes, dukes and barons. Only when Yvette goes away on a holiday she realizes that the Banker Saval is engaging her mother in such activities, she suddenly feels dirty.

It's been said, that Dr. Kugler is always ready with some gossip about the missteps and bad habits of young girls. His daughter Lisa, however, is no saint either -- only he knows nothing about it and his wife is at wits' end about it. Finally, Aunt Edith has to stick her nose in everyone's affairs and in the end, she even finds a match for Lisa.

The day before chemist Dr. Hans Wynhold leaves for a six months business trip to Africa, he meets chemistry student Christa Weiden. They spend the evening together in St. Pauli and fall in love. She doesn't tell him that she'll start the next day at the chemistry laboratory he works at too, because he says he doesn't like women in "men's jobs". Only after his departure the next day Christa learns about Hans' reputation as a Don Juan. In fear that she'll lose him to another woman, she follows him... and starts a series of complications.