one-piece vs swimming costume

one-piece

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

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

swimming costume

noun
  • the garments that one wears when bathing in the sea or a swimming pool, especially the one-piece garment worn by women and girls. 

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