boiler suit vs garment

boiler suit

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

garment

noun
  • A single item of clothing. 

  • The visible exterior in which a thing is invested or embodied. 

verb
  • To clothe in a garment. 

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