mackinaw vs overcoat

mackinaw

noun
  • A heavy woolen cloth. 

  • A flat-bottomed cargo boat; mackinaw boat. 

  • A blanket made of wool, formerly distributed to the Amerindians by the U.S. government. 

overcoat

noun
  • A heavy garment worn over other clothes, for protection from cold or weather. 

verb
  • To apply an exterior coating to. 

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