Sorry, not the greatest screen capture. There are some better "Incas" photos in this topic.
Information already provided by Curator Rick in other topics suggests that the hat in this film is an Australian military hat with a double brim. I'm not sure what "double brim" means. Is it literally a double-thickness brim? It's certainly an extremely wide brim. The hat also appears to have a rather tall crown.
I'm interested in suggestions (and links are always good, too!) for a hat reasonably similar to the "Incas" hat.