Lot of good tips here.

I'd only add that one piece of gear I use makes a huge difference: cover for my neck and lower face.

I have a "gator" made of a section of the sleeve from a wool sweater. Cut off a portion of the sleeve about 10 or 11 inches long from the upper arm portion of the sleeve. You can stretch it a bit if its a bit tight, then pull it over your head and cover your neck and lower face and you'll be surprised at the difference it makes in combination with a good quality four weather hat.