costume vs evening dress

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. 

evening dress

noun
  • formal attire worn for evening social events. 

  • An elegant dress worn by women, especially for social events in the evening, an evening gown. 

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