I suppose I should file this under, "Things we should'a seen coming" but a search of motorcycle-related patents recently uncovered this one, for a motorcycle crash helmet with a hole in the top, for the wearer's "man-bun" to protrude. Other illustrations suggest that Bell also plans to produce full-face and moto-x versions in the man-bun style.

Although I was somehow unable to print it off the USPTO site, I note that Harley-Davidson's apparel division has also filed a trademark for a so-called "Beard Rag" -- which looks like a do-rag for the rider's lower facial area. It's not obvious from their application if the Beard Rag differs in any way from a conventional bandanna.