Permethrin is an effective, relatively long term clothing treatment option for keeping off pests and the like. I've had more than a couple sets of ACUs that were treated with it, and you can buy permethrin spray at sporting goods stores for treating your clothing. Great for hunters, hikers, fishermen, etc, especially with the rise of lone star ticks carrying Alpha Gal syndrome. I'm sure it'll eventually be shown to have some sort of negative impact on wearing it regularly, but I'll take that risk over getting bit by a lone star tick and developing Alpha Gal. I enjoy my steaks too much to risk that.