mackinaw vs overcoating

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. 

overcoating

noun
  • cloth for making overcoats 

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