garment vs underwear

garment

noun
  • A single item of clothing. 

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

verb
  • To clothe in a garment. 

underwear

noun
  • Clothes worn next to the skin, underneath outer clothing. 

  • Underpants (boxers, briefs, panties, etc) and often bras. 

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