What should I wear to Lhasa in winter?

The lowest temperature in Saskatchewan in winter is about-10 degrees, and the highest is MINUS 10 degrees, which is mainly due to the low temperature in the morning and evening and moderate temperature in the daytime. Thick down jacket is equivalent to 9℃, thin down jacket is equivalent to 6℃, slightly thick elastic cotton-padded jacket is 5℃, thick woolen sweater is 4℃, cotton vest is 4℃, fleece clothes and thin coat is 3℃, thick cotton sweater is 2℃, thin cotton sweater is 1℃, and so on. If the temperature is 22℃, just wear a short sleeve T and a thin coat.

The information provided is as described above.