dressing room vs ladies' cloakroom

dressing room

noun
  • A room used for dressing or changing clothes. 

  • A room in a theatre or other performance venue in which performers may change costumes and apply makeup. 

  • A changing room at a recreational or sports venue. 

  • A small room adjoining a domestic bedroom where people may dress or undress in privacy. 

ladies' cloakroom

noun
  • A cloakroom intended for use by women. 

How often have the words dressing room and ladies' cloakroom occurred in a corpus of books? (source: Google Ngram Viewer )