garment vs housecoat

garment

noun
  • A single item of clothing. 

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

verb
  • To clothe in a garment. 

housecoat

noun
  • A longish dress-like garment of one piece, fastening down the front, worn about the house. 

  • A bathrobe or dressing gown. 

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