Clothing for the Outdoors.
Clothing must perform several important functions to keep us safe outdoors. Obviously it needs to protect us from the cold which it does by providing insulation and protection from the wind.
It needs to protect us from moisture, mainly because that moisture will effect the insulation and expose us to the cold. To do this clothing needs
to be breathable so that body moisture can escape into the air. It needs to transport perspiration away from the skin and prevent rain from soaking through to the skin. Ideally it should be easy to dry out, preferably just by wearing.
Other less obvious things it needs to protect us from are the sun, thorns, rocks, insects and other critters.
If you want to be protected from the elements, camping and outdoor shops contain a staggering amount of modern synthetic clothing designed
to keep you warm and dry in all conditions.
Of course you will sound like an old crisp packet and smell a lot worse by the end of the day, but everybody will tell you synthetics are best for outdoor activities.