Basically a jacket needs to have two properties to be warm:
a) A solid pocket of immobile air to provide insulation.
b) Enough windproofness to allow the insulation to work, and keep heat inside the jacket.
The Everest appears to have plenty of point b, but with the amount of down filling and the generally deflated look of it, I can't see how it will insulate well. Unless you have a big sweater on underneath.
So, yes, the Everest is a fine piece of retro styling based...