Unless they're baseball caps. I'm really sick of those, especially on men who refuse to take them off in restaurants.
The Art of Manliness recently posted Bringing Back the Hat, declaring that hats are due for a full resurgence. Huzzah! I hope the prognosticator is right. The fedora is there, oh yah, but I can do without the porkpie (too doofy looking). The article also shares style hints and proper hat wearing etiquette, something sorely lacking today.