thanks Tahra, Pynedor, Playmofire and GrahamB!
Jingasa= fool wears in thunderstorm
Battle fan- with sharpened points for hand-to-hand combat?
in this case, no sharpened points, my Daimyo is using his fan as a signalling device
but in may be used for fending off weapons when taken so off-guard without his sword drawn.
the wide jingasa(hat) would be most helpful during a sudden downpour for the lower ranking samurai like this one below