No bugs, ticks snakes, etc......
Two most important things or me personally- warm feet and a warm head:
Inner layer of clothing is a Varitherm wool base layer, pants and shirt. Socks include thin layer of silk socks underneath thick wool socks. I wear a pair of knee high waterproof mukluks for shoes.
Second and third layer- for me, its a fleece zip up and pants underbeath a pair of wind and waterproof shirt and pants.
Hat- simple stocking cap, but also a full head mask that is pulled down to keep my neck warm.
Gloves- neoprene fishing gloves I get a Bass Pro- they hav slits in the fingers for fishing.
Of course- I have most of the items as a back-up plan like big D does- (change of clothes, firestarter, first aid kit, etc....)