Not XJT, but ORD based.

For this particular frozen hell, I did a thermal baselayer under the pants, thick wool socks, thermal baselayer undershirt, balaclava, hat, winter coat, company trench, and ski goggles.

I would never bring that much normally but -50 wind chill can cause corneal frostbite, and regular frostbite in under 2 minutes. I know some people would make fun of me for this, but you cannot do an effective preflight in 2 minutes freezing your ass off the entire time. When you’re looking at temps that low just do what you need to do to keep from hurting yourself while allowing you to do your job.