Merriam-Webster Collegiate Dictionary - vestment

 noun  Etymology: Middle English vestement, from Anglo-French, from Latin vestimentum, from vestire to clothe  Date: 13th century  1.  a. an outer garment; especially a robe of ceremony or office  b. plural clothing, garb  2. a covering resembling a garment  3. one of the articles of the ceremonial attire and insignia worn by ecclesiastical officiants and assistants as indicative of their rank and appropriate to the rite being celebrated  • ~al adjective