The original text is gua ziluo yi 掛紫羅衣 [put on a robe of purple gauze]. Purple is the color of the court robes of high-ranking officials in premodern China. Purple holds significant importance in ancient Chinese culture.
The picture indicates that in the Yuan Dynasty and earlier, officials of the first rank wore robes in purple. See Zhong Yaqiong 鐘雅瓊, “Zhongguo gudai fushi yanse yu zhengzhi guanxi yanjiu” 中國古代服飾顏色與政治關係研究 [Study on the relationship between the color of clothing and politics in premodern China], Anhui wenxue 安徽文學, 2008 (9). https://www.cnki.net/KCMS/detail/detail.aspx?dbcode=CJFD&dbname=CJFD2008&filename=AHWA200809104&uniplatform=OVERSEA&v=CTiXpgsHIhWniqr1LXp7qvROLY4kO5ac_-3cZuFx9LjU121gMSTjDMi9lZLuLO10
