evening dress vs muumuu

evening dress

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

  • formal attire worn for evening social events. 

muumuu

noun
  • A long loose-fitting dress made of lightweight fabric printed with bright, stylized Hawaiian themes (such as flowers and palm branches). 

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