costume vs suit of armour

costume

noun
  • A set of clothes appropriate for a particular occasion or season. 

  • A style of dress, including garments, accessories and hairstyle, especially as characteristic of a particular country, period or people. 

  • An outfit or a disguise worn as fancy dress etc. 

verb
  • To dress or adorn with a costume or appropriate garb. 

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 costume and suit of armour occurred in a corpus of books? (source: Google Ngram Viewer )