Fantastic Fireman long johns, just so annoying when I wear them, as every male Dalmatian tries to hump my leg!...just kidding!... however these are sloppy fit, old school style, I recommend buying one piece dry suit diving underwear...however only only cold days, as they don't breath, and forget doing a number two till you come home and peel off those things...
The cool thing about this set up is that you can lounge around the house in them, and no one will look twice if you take out the trash whilst wearing them.