Okay. As you're all probably aware, in anything that involves aliens everyone usually has a 'hat' with humanity either being hatless or given one which doesn't suit us at all. Mostly though we're hatless. So I was wondering if a) there was any sci-fi out there where we had a hat that was actually believable, and/or b) we could come up with some possibilities (try to avoid HFY, I know it's hard but please try). In the case of the latter, for the sake of keeping things simple lets assume a standard space-opera type setting with the usual types of races that tend to populate such settings.