boiler suit vs cotillion

boiler suit

noun
  • A one-piece suit combining trousers and jacket, worn for heavy or hot manual labour. 

cotillion

noun
  • A kind of woollen material for women's skirts. 

  • The music regulating the cotillion. 

  • A bold dance performed in groups of eight where women lift their skirts to display their ankles. 

verb
  • To dance the cotillion. 

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