swimsuit vs two-piece

swimsuit

noun
  • A garment worn for swimming. 

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

two-piece

noun
  • A garment consisting of two separate parts; especially such a swimsuit 

adj
  • comprising two pieces 

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