Well they put aprons on the hens to keep the roos from tearing out the feathers, maybe a hat would work. Though how you would make a hat for a chicken I'm not sure.
I did just think of something though. When you breed phesants they can be merciless about picking at a rival. They use plastic blinders that look like bird sunglasses only they are solid. It is held in place by a plastic "bit" that passes between the beak. If you look up a gamebird supplier (Strombergs has them I think) you can find them. Put it on the ladies and see if that doesn't help.
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