khalat vs nightgown

khalat

noun
  • A type of native gown worn in parts of Central Asia, historically awarded as a robe of honor. 

  • A long, close-fitting coat with shawl collars and pockets, worn by Ashkenazi Jewish men in Eastern Europe until the early 20th century 

nightgown

noun
  • A dressing gown. 

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

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