This Doctor Who screencap contains
fedora, cappello di feltro, homburg, stetson, and stetson trilby.
There might also be
porkpie, cappello porkpie, porkpie hat, completo, vestito di affari, cappello campagna, and cappellone.
I've been watching a lot of "Doctor Who" lately and saw "The Dark Knight" a few times, and it seemed like The Doctor probably wouldn't put up with Batman for too long, and the Joker even less.