Shower in the morning before leaving, take it easy, maybe invest in some wool, and you should be good. However, some people could sweat in 40F temps with minimal exertion. As far as the pant leg getting shark bit thing, they make a
strap for that. Or roll the cuff up or tuck into your sock(s). I've used rubber bands and I've even seen someone post pics here of theirself using a binder clip.