one-piece vs swimsuit

one-piece

noun
  • A one-piece article of clothing, especially a swimsuit. 

adj
  • Composed of a single integral unit or so appearing. 

swimsuit

noun
  • A garment worn for swimming. 

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

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