This The Three Musketeers photo contains
fedora, felt hat, homburg, stetson, trilby, porkpie, porkpie hat, boater, leghorn, panama, panama hat, sailor, skimmer, and straw hat.
There might also be
dress hat, high hat, opera hat, silk hat, stovepipe, top hat, topper, beaver, campaign hat, and snap brim hat.
"They may seem a bit 'Camp' now, but once they were something special to the movie going audience." - clips from various old Swashbuckler flicks, including Musketeer movies