bathrobe vs peignoir

bathrobe

noun
  • A robe usually made of terrycloth intended to be worn when one is still damp from bathing or when there is no immediate need to dress fully. 

peignoir

noun
  • A long outer garment for women, usually sheer and made of chiffon and often sold with matching nightgown, negligee or underwear 

  • A cape worn to protect the clothes at the barbers / hairdressers 

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