Compressed hydrogen anti-mosquito trousers

As mosquitoes do tend to go for the lower limbs, I suggest a two-walled pair of trousers, which contains hydrogen from a handy belt-mounted bottle. The pressure of the hydrogen is sufficient to make it slightly heaver than air, so preventing that going upside down and floating away effect.

Any attempt to bite the human through the trousers results in mosquito being inflated with hydrogen and so floating away, thence to become lunch on the wing to any passing insectivorous bird.

Previous experiments with helium instead did not produce the expected mosquito whine going up a few octaves, so not worth the effort. Unless you are a heavy smoker and wish to avoid Hindenburg Groin scenario.