costume vs garb

costume

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

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

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

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

garb

noun
  • A type of dress or clothing. 

  • A guise, external appearance. 

  • Fashion, style of dressing oneself up. 

  • A measure of arrows in the Middle Ages. 

  • A wheat sheaf. 

verb
  • To dress in garb. 

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