I spent 5 full winters in Norway and 6 weeks each year was spent over 400km North of the Arctic Circle.
What did I wear..? British Army issue gear
On a normal working day in the field;
Thermal leggings & Long sleeved vest (later replaced with Helly Hansen Lifa thermals)
Issue OG Lightweight Trousers
Norwegian Army shirt
Army standard issue Wool Jumper (this was put in my daysack when skiing or snow-shoeing) (Also later replaced with a Norwegian Army Jumper...ace bit of kit)
Windproof Smock (wired hood version - excellent Jacket)
Two pairs of issue Arctic socks
Issue cold weather thinsulate lined boots or Issue Nordic ski boots with felt liners if skiing / snowshoeing
A pair of Meraklon inner contact gloves
Issue Fleece mittens Gortex Outer Mittens (I later replaced these with Dachstein Mittens)
Issue ECW hat (Deputy Dawg Style)
Plastic Rimmed Sun Glasses
Extra gear carried in main bergen (120Lt PLCE):
Lowe Alpine Goretex Mountain Cap
Thick Wool Balaclava (only worn when the wind got up or when Ski-Orring)
Issue Cold Weather 3-layer Goretex Jacket & Trousers (Only worn for digging snow-holes)
Seal Skinnz fleece lined Socks These replaced the Issue Goretex bootliners which I found very uncomfortable)
Spare Norwegian Army shirt
Four Spare pairs of issue Arctic socks
2 x 24 Arctic Ration Packs
Large FAK
Issue Machete
Coleman Peak Stove & Spare Fuel
Metal Mug & Racing Spoon
Snow Shovel
Patrol Pack 30-40Lt (this was carried under the top flap of the Bergen):
Helly Hansen Field Jacket (Thick Fleece)
Issue Windproof Over Trousers (Excellent)
1 ltr Alladdin Steel Flask (Hot Chocolate)
Issue '58 pat mug
1x 24hr Ration Pack
1 x Paralume Flare
Issue MOD Survival Knife
Issue Basha & 8 Bungees
30' of Paracord
Pockets of the Wind-proof Smock:
Ski-Goggles
Survival Kit
Small FAK
2 tallow long burn candles
Lighter & matches (the lighter was attached to some paracord & carried around my neck under my jumper)
Head torch with a halogen lamp
Whistle
Emergency High Carb Rations
SAK (Later replaced with a Leatherman)
Gortex Outer Mittens
Lightweight Nomex / Wool balaclava
Sleeping:
Issue Arctic Sleeping Bag (quite bulky - some lads replaced this with a snugpak bag, I believe it was the Osprey 12..?? don't quote me on that though)
Standard Issue Goretex Bivi-bag
Issue Cold Weather Roll Mat
Issue Thermal Booties (God send these were!!)
Spares: I managed to get my hands on a set of Mukluk Boots with Heavy Wool Inner Sock and and Felt insoles (only used around base camp area)
I hope this has been useful