one-piece vs swimming trunks

one-piece

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

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

swimming trunks

noun
  • A pair of shorts or briefs worn for swimming or bathing. 

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