A jacket is the transliteration of an English jacket, which is a collective term for short tops that can be worn by both men and women. A jacket evolved from a short top made of coarse cloth called Jack worn by medieval men. Jack in the 15th century had bulging sleeves, but these sleeves were a decoration and his arms didn't go through them, they were draped over his clothes. By the 16th century, men's underskirts were longer than Jack's, tied with straps to form folds around their bodies. In the 20th century, the buttons on men's jackets from the stomach down were open, and there were decorative buttons on the cuffs. The pleats on the hem were fastened to the upper hips with buttons. At this time, women's attire also transformed into fitted jackets, similar to the hunting attire worn by women riding horses in the 18th century.