I use permithrin on my trousers, outer socks and other garments that are going to come into contact with undergrowth, primarily to combat ticks and chiggers. In this role the 0.5% solution sold for the purpose is excellent. It is advertised as lasting for two weeks per application, even with a wash cycle. That should be enough that you can treat clothes before leaving home, then not worry about it again. Chiggers are able to infest clothing so that you keep getting new bites for days after having picked them up. Its well worth keeping them from coming aboard.
DEET works well on mosquitoes, ticks and chiggers somewhat, but is oily and smells pretty bad. I use it under my trousers, on shins and ankles, in tick areas, and on upper exposed skin for mossies. I prefer to keep exposed skin to a minimum and rely on loose clothing to stop bite through.
In Scotland I used a product I bought from Wilderness 1-2-1 (Robs company) that was made with Neem tree extract. It worked well to stop the midges biting, but nothing will stop them from crawling. It smelled nice, but didnt work as long as the synthetic stuff.
Also good for the midges was Autan which is a Bayer product that I found on sale in Wilkinsons. I thought it smelled better than DEET and did a good job.
I was very pleased with a product called Prevent from Agropharm Ltd. It is made from pyrethrum (found in members of the chrysanthemum family). The pressurized spray is really small, pocket sized, good for about 400 squirts, is both repellent and insecticidal and is intended for skin and clothing use. It kept the Norwegian midges from biting really well.
In the case of flies like the midge, the cleg and tsetse, colour and movement are attractors. In Scotland I found I attracted fewer midges wearing khaki/stone/tan clothing than I did when wearing loden green. In Norway with the clegs, and deer flies the same thing applied. I had flies going for my brown hat and leaving the rest of me alone. The guys with me who wore greens and darker clothes had flies going for the darkest, warmest, parts. I saw a report that somewhere in Africa they were sellectively targeting tsetse fly by treating black cloth in powerful insectiside and errecting it on a frame and setting it in a sunny spot in the bush. The flies were attracted to the large, dark, sun warmed shape.
For midges a head net is hard to beat. The repellants dont stop them walking on you and that can get really annoying. A wide brimmed hat and net give you some time out from swatting.
Now that is an impressive arsenal!
btw.: "Prevent from Agropharm" contains a natural form of permethrin. Interesting..., I don't know about skin use though. Do you still look the same after using it C_Claycomb hehehe.. kidding..
Lush