Lots of good info and advice on this thread. I will simply add that regardless of ambient temperature, get yourself a pair of DARN TOUGH SOCKS. I LOVE these socks and they come with a warranty that will knock your socks off. If there is ANY issue with the socks, send them back and they will send a brand new pair, no questions asked.
For my few forays into such weather I have worn:
Heavy merino wool socks over silk liner socks.
Merino wool under my pants.
For my upper body I go with layers on the outside rather than anything under my top. I will either wear my puffy vest under a light jacket, or a puffy jacket with a hood. If things get too wet the light jacket gets replaced by my ...
To add to MichelKejzers' and Alexander's answers
At 3 - 5 °C while hiking I often wear only a long-sleeve shirt or T-Shirt + thin fleece pollover, if the sun is shining or there isn't much wind or a bit later in winter you may even find me in T-Shirt only.
A lot here depends on acclimatization: now being fall, I'm not yet as acclimatized to cool weather as ...
This answer is based on research and my experience hiking in the United States, specifically the Midwest and Northeastern US. I mostly focus on deer season, because that's the big one in this area. Be sure to find out which hunting seasons are most popular in your area, and look up the specific dates.
Blaze orange and ANSI orange are very similar. In fact, ...
My configuration in cold weather is:
Head: Wool hat when dry, additionally hood from rain jacket when wet.
Upper body: Merino wool base layer (not too thick for me because I tend to be warm), maybe another layer of merino wool if it is very cold, down jacket (mostly worn during breaks, otherwise too warm for me), and a proper water and windproof hard shell ...
The key for cold weather clothing is layers ...some tips (some from experience, some from reading/hearing from others):
Use layers, especially on your top body
Wear something on your head (you lose a lot of warmth through your head) (moved up by comment of bob)
Your body (chest/back) is most important to keep warm
Use not thick clothes, but more thin ...
As others have already mentioned, a menstrual cup is perfect for traveling, and in your case, trekking.
Less to carry around - you only need ONE menstrual cup
If you don't have access to water there are specially designed menstrual cup wipes that you can bring along
Some menstrual cups can even be folded down to just a couple of millimeters and stored in a ...
From your question I cannot figure out on what terrain, what climate, what continent you wish to hike on :) but this read might be an interesting one for you.
There is a guy from Hungary who travels with his donkey, mainly on the El Camino route, but also all around Europe. Here is his facebook page (also with English stuff, but pictures can be useful too) ...