fedora vs sunbonnet

fedora

noun
  • A felt hat with a fairly low, creased crown with a brim that can be turned up or down. 

sunbonnet

noun
  • A hat (bonnet) worn for protection from bright sunlight. 

  • A plant of the genera Leibnitzia or Chaptalia, native to Asia and the Americas. 

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