cover-up vs swimsuit

cover-up

noun
  • An item of clothing to be worn over a swimsuit while not in the water. 

  • An attempt to conceal or disguise something, especially a wrongdoing or a mistake. 

swimsuit

noun
  • A garment worn for swimming. 

  • A tight-fitting one-piece garment worn by women and girls. 

How often have the words cover-up and swimsuit occurred in a corpus of books? (source: Google Ngram Viewer )