kaftan vs pallium

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. 

pallium

noun
  • A large cloak worn by Greek philosophers and teachers. 

  • The mantle of a mollusc. 

  • A woolen liturgical vestment resembling a collar and worn over the chasuble in the Western Christian liturgical tradition, conferred on archbishops by the Pope, equivalent to the Eastern Christian omophorion. 

  • The cerebral cortex. 

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