Lightweight clothing for winter trips
Some years ago I decided to test the theory that you could use the same lightweight baselayers and shells in winter as in summer. The only difference should logically be that you need more insulation in your middle layer(s).
Me wearing a Marmot windshirt in some biting wind. As could be expected it worked very well, windproof and did not collect moisture inside. Weight: 160 grams.
This  photo shows my storm shell, which came to use during this trip. It was my regular summer rain smock, Haglöfs Oz. It kept me dry and comfortagle as I retreated from above timberline to the birch forest in some hard winds. Weight: 200 grams.

The third photo shows an ultralight windshirt in a beta-version that I tested for Fjällräven. It never made the stores. It was special by having short sleeves (which can be glimpsed) and no back. The theory being that your pack would cover your back anyway. Weight: 39 grams.
Underneath these shells I wore a number of "undershirts' depending on how cold it was and how vigourosly I moved. The baselayer ("there can be only one") was my summertime merino one.