How hat fashion has changed
Two pictures showing the difference in hat styles in the fifties to modern westerns
http://fandomania.com/5-alternate-settings-for-the-magnificent-seven/
http://tv-shows.prettyfamous.com/l/13942/The-Magnificent-Seven
Personally I prefer the fifties style but maybe that's just a yearning for the golden age.
Judging from old West photographs neither style is accurate, it seems back then they just put anything on their heads that fitted.