The theme for winter in Europe is layer upon layer upon layer…
Icebreaker makes some fantastic pieces from singlets through to long sleeve t’s, through to light weight jumpers through to outer wear. The icebreaker clothing is all made from merino wool, but really soft and really light, so packing is really easy. They also make socks which I lived in when I went in 2010. Also, take a woollen scarf or two - not polyester as this won’t keep you warm. Your jacket will need to be not only waterproof, but wind proof - out of everything it is the wind that will be the coldest!
Take boots that are waterproof but that you don’t mind getting scuffed. They do salt the streets in Europe in winter and this causes the colour to bleach from leather. When I was on tour, the girls were wearing almost 50/50 hiking boots or boots made for walking around at the snow - make sure they have grip. Sneakers will be a complete waste of space. Below is a list that you might find handy:
Umbrella - Compact with a zip up case (this will stop water getting everywhere)
Plastic Raincoat - The king that costs $2 at Woollies is fine
Travel towel (and if you have long hair - quick dry hair towel)
Travel hair dryer - there’s nothing worse than going out in the winter with wet hair!
Jumpers x 2 - don’t take more than this. If you want more, buy over there.
Tops x 3 - don’t worry, everyone else is taking minimum clothing as well
Pants x 2 - very few people (guys or girls) on our tour took jeans for a couple of reasons - they take forever to dry when you wash then, they aren’t particularly warm, and if they get wet when you’re out and about, they stay wet. Take some thicker pants instead, or take thick leggings, that you can layer thermals under
Thermal singlets x 2
Thermal tights x 2
Socks x 3
Undies etc x 4 sets (this will be enough to get you from one laundry to the next) and hand washing is also easy to do
Scarves x 2
Gloves x 2 - 1 wool and 1 leather
Hope this helps