manteau vs nightgown

manteau

noun
  • A cloak or gown, especially of a kind popular with women in the 17th and 18th centuries. 

  • A long, loose-fitting coat worn by Iranian Muslim women based off the trenchcoat, originally worn with a square Arabic-style hijab and in plain colours, and often associated with liberal politics. 

nightgown

noun
  • A dressing gown. 

  • A long loose robe worn mainly by women for sleeping in. 

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