About gear, its a difficult one, I was on the winter WEISS course in March last year, and our problem was, we didn't know how cold it was going to be, which was a big problem, because at -20 deg C the conditions change from wet to dry, which can change your gear choices a lot.
In the end I took clothes that I could layer, and made sure I had waterproof gear that would go on top if required. As a guide here's what I took;
Base layer;
Merino wool, the best quality at a decent price I could find, which at the time was
Chocolatefish, I wore 2 layers of those.
I also bought and wore as a base merino wool boxers and longjohns from there.
Mid layer was a
Ullfrotte top, I think a 200 gram, but I'll check.
Outer changed but it was mostly my BushcraftUK Ventile jacket with a down waistcoat over the top. Trousers were lined Craghoppers
I wore a winter buff around my neck, and usually merino/possum gloves and hat also from Chocolatefish. I also had Scandinavian winter leather gloves which came with 2 pairs of warm liners, only used them once as they got soaked because it was too warm (snow was wet), it averaged about -8 to -12 deg C, one night hit -20 with wind chill and the morning we left it was -13.
I had a set of army surplus gortex waterproofs with me as well in case I needed to throw them over the top.
Footware; I read up a lot about this, and finally decided on a pair of Sorel boots rated to -40 from
Cabelas I think they worked out at £50 delivered !
Socks; I had merino thin socks as well as wool thicker ones, the boots themselves came with a lining that could be worn as a camp shoe.
Gaiters, get a good pair and make sure they fit whatever boots you buy, there is nothing worse than stepping into a deep pocket of snow without gaiters on, apart from thru ice into water (not recommended).
Hat is a russian style ski hat, ancient, but worked well
Jacket is the Alpkit Filo down jacket
I must admit I spent a fair amount on merino wool clothing, but it wasn't a bad buy, I use it all the time. The only time its not used is in the height of summer.
The only piece of equipment I haven't used since I got back, apart from the winter gloves, is the Sorel boots, even Scotland in the depths of winter would be too warm for those beasts.
Cheers
Stephen