costume vs kaftan

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. 

kaftan

noun
  • A long dress or shirt similar in style to those worn in the Eastern Mediterranean. 

  • A long tunic worn in the Eastern Mediterranean. 

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