I wouldn't dispute that finding as I usually re-apply after third washing even after using a gentle detergent.
Trudging through SW and NW deserts and mountains have so far been lucky in not getting bit. Years ago, coming home from a climbing expedition that entailed some bushwhacking, felt an adult tick that just had started to attack my arm pit...glad I felt it...
Yeah, be sure to thoroughly wet the garments with extra attention to cuffs, belt line, etc. before allowing to dry. Don't scrimp on the amount applied. Some apply two applications.
You can send off your hunting clothes to companies that will treat your items more thoroughly or purchase apparel that is factory treated which is more likely to wear out before the permethrin does.
