robe vs vestment

robe

noun
  • A long loose outer garment, often signifying honorary stature. 

  • The skin of an animal, especially the bison, dressed with the fur on, and used as a wrap. 

  • A wardrobe, especially one built into a bedroom. 

  • The largest and strongest tobacco leaves. 

verb
  • To put on official vestments. 

  • To clothe; to dress. 

vestment

noun
  • Clothing. 

  • Any of the special articles of clothing worn by members of the clergy etc., especially a garment worn at the celebration of the Eucharist. 

  • A robe, gown, or other article of clothing worn as an indication of office. 

How often have the words robe and vestment occurred in a corpus of books? (source: Google Ngram Viewer )