bathrobe vs poncho

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. 

poncho

noun
  • A simple garment, made from a rectangle of cloth, with a slit in the middle for the head. 

  • A similar waterproof garment, today typically of rubber with a hood. 

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