I wouldn't tuck my pants into my socks because it leaves the top of your boots exposed. Those little critters can squeeze in through the top of your boot.

What I would do is get lightweight, light-colored fishing pants that don't have zip-off legs with an extra-long inseam. After you put your pants and boots on, drop your drawers and tightly blouse your pants to the outside of your boots. Use really good blousing straps, large ranger bands, or duct tape. That is what I do and it works very well for me, YMMV. I then do a full body check when the day is over. Those little critters will get into the craziest places.

The whole trick is light-colored clothing with long sleeves and gap/opening control.