Well whatever I like a pullover garment because it is more weatherproof at the end of the day, and you can have full width kangaroo pockets. Pit zips are useful though, oh dear did I mention zips, in the old day it would have been laces or buttons.There are no Eskimo any more. All are Inuit, not some white man's name any more.
My preference is a garment with a big brass YKK 2-way zipper. Have you got those?
You can open from the bottom for ventilation as you wish.
Any zippers with smaller teeth, the plastic ones are the worst, tend to freeze up faster.
Seems to me that some britons call an anorak for smock. Whereas for me a smock is a military jacket with large pockets and zippered.Can somebody explain the difference between a jacket and a smock?
I am mightily confused!