legging vs undergarment

legging

noun
  • A covering, usually of leather, worn from knee to ankle. 

  • The process of putting a series of three or more options strikes into the stock market. 

  • One of the legs of a pair of trousers. 

  • Tight fitting leg coverings worn, for example, to gym. 

undergarment

noun
  • Any garment worn underneath others, especially one worn next to the skin; an item of underwear. 

  • Temple garments worn by the followers of the Church of Jesus Christ of Latter-day Saints. 

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