Stetson vs fedora

Stetson

noun
  • A type of felt hat with a wide brim, typically worn by cowboys. 

name
  • A surname. 

  • A male given name. 

fedora

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

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