djellaba vs kaftan

djellaba

noun
  • A loose-fitting, ankle-length hooded robe worn by men in North Africa. 

kaftan

noun
  • A long tunic worn in the Eastern Mediterranean. 

  • A long dress or shirt similar in style to those worn in the Eastern Mediterranean. 

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