Cold weather with little wind and no snow or frost
by Michael Becker
(Tabernacle NJ USA)
If you're in an area even where it is VERY cold, but there is minimal wind and no snow and you have your fire going, you can strip down to just that clothing which is covering those parts of your body that are touching natural surfaces (feet and rear end only) and expose the entire rest of your body to the radiant heat from your fire.
Since that heat would not transmit through your other clothing, wearing any clothing that prevents your body from warming up by that radiant heat would defeat the purpose of the fire itself. If you can be completely nude without freezing your rear end or feet that would also be advisable.
You might also hang your clothing in ways that the interior of those pieces of clothing can be heated by that fire while you're not wearing them.
I have done this on a number of occasions (with shoes and shorts or completely nude depending on the EXACT conditions of that situation) and have sometimes found that wearing little (if any) clothing around my campfire not only warmed my body faster than leaving all of my clothes on, it also warmed my clothes faster than my body heat does, and so by placing both my nude body and my clothes all around the fire I was actually warmer for longer periods of time than if I had kept my clothes on for the entire time.