Hi, I've got a plume/braid (not sure what you'd call it) of dark brown horse hair I've been meaning to get rid of. I bought it to try my hand at braiding a wookie scalp for my Fett with but ended up just buying an artificial set of them from a run on TDH. Its 23 inches long and about an inch thick of hair tied together with string.
AM I the only one that caught the "Kurgan" mentioned? Would love to see pix of that even of the beginning stages. This guy in Phoenix made one similar but out of all leather. He sculpted the leather than painted it after he got the proper shape he was looking for. I bet if you had any equestrian stores nearby they may have some or even a feed store.
I bought horsehair directly from a company that makes and reconditions bows for playing violins, cellos etc. They have different grades of hair for different quality bows, I just bought a lot of the cheapest grade. Here's a link with pics of my helmet.