corselet vs underclothes

corselet

noun
  • A tight-fitting item of clothing which covers the body and not the limbs. 

  • An entire suit of armor, made up chiefly of the breastplate and backpiece worn with a headpiece and with a gorget, pauldrons, vambraces, gauntlets, and tassets attached. 

  • The thorax of an insect. 

  • Armor for the body, for example a breastplate and backpiece taken together. 

  • A type of women's underwear, combining a bra and a girdle in one garment; a corselette. 

underclothes

noun
  • clothes worn next to the skin and underneath outer clothing 

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