I wore a super thin base layer and then my down (or synthetic, forgot to check) over that. They’re basically the weight of a down skirt, except more practical for me.
On top I wore thin long sleeved base layer, my regular polar fleece mid layer, a thin down vest, a windproof jacket, and my lightly insulated ski coat. I knew I'd be warm, but I couldn’t figure out which layer to leave off so I just planned to strip down appropriately once we got going. For the record, I think it would be the windproof layer - although what I actually took off was my thin vest, because that would fit in the backpack best. Then I just unzipped everything else. Remember, we didn’t have to break trail at all, or climb much, although we did take detours to do both.
Wool socks, waterproof hiking boots, ski mitts, and a beanie type hat. It wasn’t snowing or blowing, and, as you can see, no chance the sun was coming out!
Oh, and temps were in the teens - 19, I think?
And we did take off the masks right after the picture. Just had kind of forgotten they were on.