leotard vs two-piece

leotard

noun
  • A one-piece skintight garment with or without sleeves and without legs (often worn by gymnasts, acrobats, wrestlers, female swimmers, etc.) 

two-piece

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

adj
  • comprising two pieces 

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