Pants, or trousers, were used by peoples of the Northern Europe, Asia,
and by nomads, such as Mongols and Kumans. Naturally, they were most
comfortable for horse-back riding and in cold weather. The pattern
construction for pants is more complicated than that for simple hose,
especially if the pants are supposed to be tight. As a result, pants
did not become popular in medieval Europe until 16th century.