In a bunch of films and other entertainment, when characters find themselves in a cold place with no heating but must sleep, they conclude that to stay warm, they should sleep as close to each other as possible —and naked.
I think it sounds reasonable, until the “and naked” part.
Can reducing clothing help keep you more warm in the sheets with another human?
Or is this just a Hollywood excuse for awkward / intimate encounters?
Significance support: The one example in entertainment that springs to my mind right now is the mention in Big Bang Theory season 3, episode 1 here. I've encountered multiple people independently making this claim, usually backing it up with waffle to the tune of "clothing would insulate you from the other person's warmth" or "having bodies touching reduces their total surface-area to volume ratio, which is warmer".
Related questions: It's definitely not warmer to sleep naked in a sleeping bag, but that's just 1 person. (Also asked on Skeptics SE.)