SHAMELESS PLUG:
I finally found my unicorn winter parka, an LL Bean Wind Challenger. Amazingly well designed.
1.) fully adjustable, helmet-compatible hood. 2.) two way waterproof front zipper. 3.) WOVEN down baffles. Â 4.) two hem elastic cinch cords. Â 5.)EXTERNAL pockets-> 2 hand warmer, one Napolean, one left forearm RFD ski pass card pocket. INTERNAL->left large mesh “drying’ pocket, upper right “trail map” pocket and… 6.) generous pit zips
I would say this parka is good for -20 F. with decent mid layer like my heavy Norwegian sweater over a  BRYNJE base layer. Plus the fabric is mildly stretchy and tough.
Yeah it is made with “only” 650 DWR treated down but I’m likely not stuffing it tightly for packing and it resists compression a bit more when leaning against the back of a lift chair on a long, freezing ride up a windy mountain.
So hallelujah! I done found my unicorn parka.