Found carrying a spare baselayer is golden. Enhances warmth and being dry, always.

Sleeveless vests work well for midlayer.

Removable fleece over lower mid layer.

Am testing two King's Camo Guide waterproof fleece layers jacket (snow shadow and desert shadow)...need a trip in really cold temps to finalize assessment:

https://www.kingscamo.com/collections/snow-shadow/products/storm-fleece-jacket-in-snow-shadow

After using almost a dozen different outer shells/parkas, have settled on the ECWCS type parka or equivalent such as TruSpec. Virtually a mobile storm tent w/ pant of same at moderate cost. Good to modest pace with gear. Has good venting.

Bib-type pants from a major label are recommended for deep snow conditions.

The really expensive parkas with the most modern breathable fabrics are superior IF you want to spend the $$.

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Pronoun: Yes, SIR !