I have been treating my hunting clothing going on almost 10 years myself Norman. The ONE year I thought I did but didn't (2015), I got a tick and developed Lyme disease that put me in the hospital that September. I was on my back for a month literally. Had every classic symptom too. Right down to the urinary urgency and incontinence. I took a very short, 10 minute walk the other day out to my inlaws place and came back to find 2 deer ticks on me. It was February and we had a HARD winter here. Far too early to be finding them this far north this early!
If you mix your own, I suggest the livestock concentrate from tractor supply. It's 10% and you dilute to about 0.5% for clothing treatment. Saturate anything that touches the ground, trees or bushes and let it dry. As long as you don't soak it from heavy rain or wash it, it'll stay effective for about 2 weeks.