brigandine vs chain mail

brigandine

noun
  • A coat of armor for the body, consisting of scales or plates, sometimes overlapping each other, generally of metal, and sewn or riveted to linen or other material. 

chain mail

noun
  • A flexible defensive armor, made of a mesh of interlinked metal rings. 

  • A chain letter. 

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