Lets see.
Tip one would be, everything goes in the hammock with you. Get a bag & such for your boots so they don't make to much of a mess of things, but you need to keep them warm so you can put them back on. Mostly with out immediately (or eventually) going into hypothermia, but also because they can freeze/shrink into a shape you won't be able to get back on. All the crap you've carried with you will act as insulation & your bodyheat will keep it from freezing overnight. Same as if you where winter camping with a tent.
tip two.
Down is great right up to the point where its not. Have some synthetic to fall back on. Personally I don't use any down due to enough bad experiences that would have been disasters with out synthetic to save the day. Think 20ish miles into the back country when a cracked nalgene bottle has just drained into your sleeping bag at the bottom of your pack. Now imagine you wont find out about it, till you make camp in another 5 miles. Now make the overnight hi -24 F. The bag is still a frozen brick when you get it out of your pack, but if its down your dead.
lets see what else... the rule of 5 & 3. Ah layering...
not including your sleeping bag, quilts, pads... you need 5 layers for your top & 3 for your legs. As for tops that would be say a bass layer, a light shirt (think wool polo), mid layer (fleece, softshell or puffy. Think something like the Arcteryx atom light hoodie) hardshell, & then your belay style, maxin at basecamp, monster parka.
Granted many can get away with 4 layers for their top by skipping the shirt in favor of a heavier mid layer but the flexibility is useful.
from there..
Make sure everything has a hood. & if it can be long sleeved with a 1/2 to 3/4 to full zip for venting. Even better.
bring more than 1 pair of gloves & mittens.
dry socks for bedtime.
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