《礼记·郊特牲》
农夫头戴黄冠身穿黄衣，是因为季秋草木黄落，服象其色的缘故。
野夫黄冠；黄冠，草服也。
The farmers wore yellow caps and yellow clothing because the grass and trees withered and turned yellow in late autumn, and they dressed in imitation of the season.