HERE. They came into fashion at the beginning of the 12th century and were popular at least until the end of the 14th. Mostly found among the privileged classes, apparently. In the Davis sketch he has a Robin Hood-ish hat. So, some medieval English fellow is about as close as I'd care to identify him. And the Robin Hood hat isn't even used. I think he's one of the less successful ghosts in the mix, for the very reason that he doesn't "place" very well at a glance, or even when scrutinized closely.