What is the relationship between Mongolian costumes and geographical location?

It is directly related to the cold in the north.

Ancient Mongolians had no handicraft industry, could not spin, lived a primitive life and lived in a slave society. People could only wear all kinds of fur clothes to keep out the cold. This is the earliest Mongolian robe. Later, Mongolia was ruled by Liao and Jin Dynasties, and the nobles began to get clothes as gifts. It was only after the rise of Mongolia and the elimination of the sinicized Jin Dynasty that the silk and cloth of the nobility became popular. But the Mongols were born arrogant and divided the whole country into four classes. Naturally, the upper-class Mongolians were unwilling to learn handicrafts, so that after the Yuan Dynasty was destroyed in the Ming Dynasty, Mongolians had to go south frequently to gang up and rob all kinds of handicrafts.