gambeson vs suit of armour

gambeson

noun
  • A defensive garment formerly in use for the body, made of cloth stuffed and quilted, often worn as padding under armor. 

suit of armour

noun
  • A collection of garments, usually made of metal, worn over the body for protection in battle from weapons. 

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