The original text is yunguan 雲冠 [cloud caps], probably refers to juanyun guan 卷雲冠 [cirrus-cloud caps]. Also called tongtian guan 通天冠 [sky-reaching caps], this style of caps used to be worn by emperors. It was invented in the Qin Dynasty and was banished in the Qing Dynasty. See https://cidian.qianp.com/ci/%E5%8D%B7%E4%BA%91%E5%86%A0 and https://cidian.qianp.com/ci/%E9%80%9A%E5%A4%A9%E5%86%A0.
In the story, it is a part of what the author imagines to be outfits for gods in the heavens.
This is a vectorization of an illustration from the Chinese encyclopedia Gujin Tushu Jicheng, section “Ceremonial Usages” 古今圖書集成·經濟彙編·禮儀典·第三百二十八卷.
A cartoon image of an emperor wearing tongtian guan.
