Hey pal if you’re working 16hr days on a fire camp in the middle of nowhere Nevada, pajamas aren’t exactly practical. Also, somehow it goes from 110°F during day to 30°F at night so forget sleeping in only underwear.

I knew a few guys who’d not only wear jeans but wear them beneath their nomex (fire resistant cargo pants) to stay warm at night. Honestly during the day you just wear nomex because they’re more breathable than jeans anyway, so in a way the jeans were only worn for sleep once the supply tent got set up