bathing suit vs swimsuit

bathing suit

noun
  • A tight-fitting garment worn for swimming, especially the one piece garment worn by women and girls; a swimsuit. 

swimsuit

noun
  • A garment worn for swimming. 

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

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