A camouflage bucket hat with a net hanging from the brim
Designed for the jungle/swamp to stop you getting bitten by bitey insects, especially mosquitoes.
Not living near a mosquito-infested area it's not of practical use for me, but knowing how rubbish mosquito relevant chemicals are, this has got to be a far better solution.
At the midpoint of the net is a nice ring which helps keep the net away from your face and provides weight to keep it down and the bottom edge is a tighter section to stop mozzies get in under the net.
I found this going cheap on an auction site, so snapped it up.