I think it may be a regional thing. Baseball caps are the norm here is the US. Flat caps are a bit difficult to find.
Cheers,
Mark
I believe they are called 'Newsboy' caps over the pond.
On the subject of hats
There is a very good photo of HFC Morgan driving a 3 wheeler sporting a rather fine 'bowler' or 'Coke' (pronounced cook) hat in the Morgan Museum
Interestingly, long before the British businessmen adopted the bowler in the city, the 'Bowler' or 'Derby' as it was called in The States, was the fashionable and essential headwear of the American West.
Its a pity that the baseball cap has become so ubiquitous
