swim briefs vs swimsuit

swim briefs

noun
  • A briefs-style male swimsuit such as those worn in competitive swimming, diving, and water polo. 

swimsuit

noun
  • A garment worn for swimming. 

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

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