What clothes should I wear to climb mountains in weather above zero and eight degrees?

Autumn trousers or thermal underwear, sweaters, down jackets. Eight degrees weather in mountainous areas is relatively cold than in cities, and the air pressure is lower than the ground. Wear as much as possible. Moreover, there will be physical exertion and sweating on the way to climb the mountain. When you reach the top of the mountain, your body is in a state of fatigue. If you feel hot, you can leave. If you are cold, you may have nothing to wear. Try to keep warm and get ready!