The wool blanket thread (and others) has me thinking about the extra clothes I keep in my hiking kits and GHB. The purpose of these is for an extra layer of warmth for an unexpected overnight and also for something to wear while my primary clothes dry, should I somehow end up soaked.

I carry a wool jacket in my short hike kit and a polar fleece top & bottom in my long hike kit/GHB, along with wool socks and mitts, thinsulate neck gator and hat, as well as an emerg poncho, in both kits. I have rain pants in the GHB as well and I also just picked up a Polar Buff that I'll probably EDC.

What do you carry for back-up clothing and why? Kit fiddling - ain't it fun?