Body fat. Enough said. I certainly have plenty of it, which is why I don't bother to take the "extra food" suggested as the whateverth essential.
Socks as gloves (if dirty, might be a bit smelly).
Plastic bags as glove overmitts.
TP (if I don't need it for its original purpose, which I usually do) plus hand sanitizer, a great fire starter (although I've never needed a fire yet, and if I do I'd use the firestarter I have in my emergency/first aid kit).
As Jim says, sometimes we get a little ridiculous on this multipurpose bit. On the other hand, it's nice to know we have some backup, however weird, in case the excrement hits the fan!
May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey