oilskin vs pakamac

oilskin

noun
  • A raincoat made from cotton fabric treated with oil and pigment to make it waterproof. 

  • Cloth made from cotton and treated with oil and pigment to make it waterproof. 

  • Foul-weather gear worn by sailors, whether of natural or synthetic materials. 

pakamac

noun
  • A lightweight mackintosh that can be folded up into a small pack when not in use. 

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