to keep them self's warm and
People who want to keep the sun out of their eyes wear hats. People who want the keep their head warm wear hats. People who just want to look cool also wear hats.
Head masks. If you see movies, burglars usually wear them. Normal people wear them too, when necessary.
A region is geography and a piece of geography can not wear clothes. However, the people in the arctic regions have to wear very warm clothes in the winter, layers of clothes are best protection.
Coat
shoes
gloves?
gloves.
I wear UGG boots or slippers
Yes, "sweater" is a noun. It is a type of clothing item that people wear to keep warm.
The use of thermal clothing is to keep one warm in the winter months. People who do winter sports wear thermal clothing to keep warm and many people wear thermal socks or gloves during winter.
They would wear Elepants!