In the Sengoku period (period of warring states in Japan), uchigi (ordinary kimono) which had ever been a formal attire for ladies of a high-grade warrior went out of fashion, and then ladies of a warrior got to put on the uchikake (long outer robe) over to show up dignity and protect against coldness.
戦国時代(日本)、それまで高級武家夫人の正装であった袿が廃れた後、武家女性は威儀を正すためと防寒のために上から打掛を羽織るようになった。