When working in Sub Sahara Africa, our clothes were washed with permethrin every cycle and we used Picaridin on our skin. This combination proved very effective. Deet was initially available, but subsequently removed due to health issues and the damage it caused to anything plastic. I didn't feel under-protected at any time. Our activities took us out into the bush during the night in areas of heavy mosquito vector so we were very exposed to bites. We were of course, all on a course of chemoprophylaxis, but this in itself, will not prevent bites. I use the same combination here in the UK on 2 x ranges I shoot on. Both of these ranges support high numbers of ticks / horseflies and I haven't been bitten yet. Knowledge and preparation goes a long way ...
Jamsie