Literature Reference: In plain clothes and red collar, I follow you to Wo. Source from 'The Book of Songs: Tang Feng - Yang Zhi Shui'.
素:
Simplicity and refinement. When used in names, it often signifies pure character and superior qualities, which are conducive to earning others' affection and trust.
衣: Garments and attire, when used in personal names, metaphorically signify elegance, grace, and captivating beauty.
Meaning: Plain clothes symbolize purity, simplicity, and elegance, representing inner purity and nobility.