Speedos vs one-piece

Speedos

noun
  • A tight-fitting brief or bikini style swimsuit. 

one-piece

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

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

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