one cannot find the 11% permethrin concentrate to mix your own 0.5% clothing treatment any more, but the pre-mix is still available if you are willing to pay.
This Anti Mosquito Spray can be used on clothes, tents and sleeping bags to protect you from mosquitoes and tropical diseases.
www.lifesystems.co.uk
I remember reading of tests done by the US Forestry Service where plenty of ticks were found slogging around on boots that were actually wet with DEET, but the folk with permethrin treated clothes picked up none, or nearly none. That said, there is published evidence of DEET working as a tick repellent, it is just that permethrin is more effective on clothes and more pleasant, no melting of plastics.
As for on-skin repellent, I don’t like DEET and have been using something with 20%
picradine for a number of years. I find it works, and again there is research showing comparable results to DEET, although it does seem to depend a bit on which product is used.
For camping in tick crawling woods, a tent with sewn in sleeping area, or a hammock, is the way to go. Nets keep the mossies off too.