Well, I think it all depends on the weather. Or part of the world. Or sporting event. I have many "ball caps," and they are certainly multi-purpose. Excellent if you choose not to wash your hair for a couple days. I've also been known to sport a fedora, but they seem best either in winter or in generally colder climates. "Pork pies" fall in this category, too, but are always great at a jazz show, no matter what time of year. Then ya got yer "cowboy" hat. I have a straw one for the river or beach, but I wouldn't wear it anywhere else. OH! Let's not forget the knit caps and beanies in super-cold months.