garment vs undergarment

garment

noun
  • A single item of clothing. 

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

verb
  • To clothe in a garment. 

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 garment and undergarment occurred in a corpus of books? (source: Google Ngram Viewer )