>>2476455My best advice is to use only natural fibers. Wool is absolutely your friend and you can pair it with good quality soft linen as an undergarment if you so wish. I will try to layer with a cotton henley shirt base this year so we'll see how that works out but my experience says linen is the best.
Then you should layer up. Use different thicknesses of layers that you will stack on top of each other and that you can take off if needed. For that purpose I wouldn't go too heavy.
Here's an example of the layers you could wear
Comfortable, breathable underwear, and made to avoid chaffing, warm breathable woolen socks
As a base layer, go for an undershirt of some kind, linen is my go to choice but you gan absolutely get merino wool or try out a cotton Henley. I'd say to keep it light down to a -5°C temperature. My advice is to avoid shirt collars and keep a neck cut.
For the pants a nice thick pair of pants may be enough, either wool, velvet, denim or else could work, I don't really focus on this, I just tend to add tight fitting underpants if I'm really cold.
The secondary layer is the most important, because it generally is dictated by the outside temperature, the best you can do is get a number of wool and flannel shirts with various densities and thicknesses and choose according to the weather. My favorites are the ones that aren't button down, like the Henleys.
The third layer at this point is just optional, it really depends on you and your precise situation. Use a sweater, a jacket, a vest, anything you want.
I would advise you on getting a good wool coat, that at least covers your ass. Knee length should be the maximum if you are to do any physical activity.
Footwear depends on your situation, add a second pair of socks if needed, felt insoles, don't cheap out on good boots, get the pair that's appropriate for YOU.
Accessories are situation dependent too, gloves, a cap, a knit scarf... Whatever you need.
