When I used to live in Canberra... midwinter observing session meant:
- thick woollen socks with thick leather boots over (toasty feet means comfort);
- fine merino wool thermals + jeans + ski pants with bib and braces,
- fine merino wool top (full length sleeves) + lumberjack cotton top (yeah i know, look like an idiot), then jumper,
- Balaclava over face and head,
- Down-filled ski parka with hood over the lot.
You could lie on the ground and stay cosy all night without needing a sleeping bag in -10 degrees.
In the upper Blue Mountains I omit the ski pants, the ski parka, balaclava, but wear a merino-mink jacket and a double-knit woollen beanie. North Face jacket optional.
BTW merino-mink is incredibly warm yet light, if you have a wind-proof shell over the top to keep the wind out the chances are this is enough anywhere in Australia.
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