Literature Reference: 卸却宫妆锦绣衣，黄冠素服制相宜。——《宫人入道》 She shed her palace robes of brocade, and the plain attire of a Daoist priest suited her well. Source from 'Gong Ren Ru Dao'.
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.
服: Clothing and Adaptation.
Meaning: Plain attire symbolizes simplicity, elegance, and transcendence.