pinafore vs rompers

pinafore

noun
  • A sleeveless dress, often similar to an apron, generally worn over other clothes, and most often worn by young girls as an overdress. 

rompers

noun
  • A one-piece garment for babies and small children, consisting of a top and trousers. A romper suit. 

How often have the words pinafore and rompers occurred in a corpus of books? (source: Google Ngram Viewer )