négligée vs underwear

négligée

noun
  • A woman's loose-fitting nightgown, especially when short, lacy and/or revealing; a nightie. 

  • A necklace of beads, pearls etc. 

adj
  • In the style of a negligee; revealing, titillating. 

underwear

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

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

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