名詞 vestment:

1. gown (especially ceremonial garments) worn by the clergy

vest.ment

n.（名詞）
A garment, especially a robe or gown worn as an indication of office or state.
衣服，服裝：顯示職位或身份的一種衣服，特別是長袍
Ecclesiastical Any of the ritual robes worn by members of the clergy, acolytes, or other assistants at services or rites, especially a garment worn at the celebration of the Eucharist.
【基督教會】 法衣：由神父、僧侶或其他在宗教儀式上的助手穿的一種法衣，特別在圣餐儀式時穿的衣服

來源：
Middle English vestement
中古英語 vestement
from Old French vestment
源自 古法語 vestment
from Latin vestomentum
源自 拉丁語 vestomentum
from vestore [to clothe]
源自 vestore [穿衣]
from vestis [garment] * see vest
源自 vestis [衣服] *參見 vest

【引伸】
vestmen.tal