Good patent Guru!
If milkweed is not around your area cattail works pretty good, better than cotton or yarn.
The way I've always done it is put the down in a plastic bag. When I get on stand I take a pinch of down and smear it onto my fleece/wool pants or jacket. Some falls off but a lot stays stuck to the pile of the garment. Then I just reach down, pluck a few fibers off the top of my thigh and let them go.