bathing suit vs swimming costume

bathing suit

noun
  • A tight-fitting garment worn for swimming, especially the one piece garment worn by women and girls; a swimsuit. 

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 bathing suit and swimming costume occurred in a corpus of books? (source: Google Ngram Viewer )