https://explorersweb.com/buying-polar-gear-a-general-tip/
Excellent request. Because you're right: You can go overboard with some arctic gear -- a $250 shell and a $900 shell can be just as good -- whereas with some gear, like sleeping bags, you have to dig deep into your pocket. No $400 sleeping bag works at -40. Let me think of how to approach it.
With your experience, would you consider doing an article about "affordable" gear for truly cold conditions? Where is cheap stuff OK, and where is the additional cost of higher end stuff really worthwhile?
For example, my current heaviest gloves cost $50, and they work better (and are far tougher) than the crappy $120 ones I had before. On the other hand, the $40 pair of socks that made me wince during purchase have been totally worth the money.