housecoat vs robe

housecoat

noun
  • A longish dress-like garment of one piece, fastening down the front, worn about the house. 

  • A bathrobe or dressing gown. 

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. 

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