on the first pair, then after i put on my pants i put on the second pair and fold my pants leg over, then pull the second pair of socks up over that folded pants leg. that way everything is tucked in, giving them no easy direct access to skin. that area goes down into my tall boots.
that way they can't just crawl up your boots and get under your pants and to your legs.
i do the same with my shirt, tuck that in too. if you don't they have easy access to your skin.
that for the most part keeps them from just going in easy to get to skin, 