Parsing Reality

[kellista]

Does anyone know if there's a definitive source for the image of "the film director", with monocle, jodhpurs, riding crop? I believe they're also depicted carrying a megaphone and wearing a beret sometimes. I've heard names like Otto Preminger, Fritz Lang, and Erich von Stroheim, but none of their Wikipedia articles mention their manner of dress more than in passing. There has to be some place that this stereotype got its start, but I can't find it. Maybe it's a creation of a cartoonist/caricaturist, but I'm not even sure how to start researching down that path.