Stetson vs headgear

Stetson

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

name
  • A surname. 

  • A male given name. 

headgear

noun
  • A type of orthodontic appliance attached to dental braces that aids in correcting severe bite problems. 

  • The harness that fits on a horse's head. 

  • The lifting gear at the head of a mine or deep well. 

  • Anything worn on the head, such as a hat, hood, helmet, etc. 

  • The rigging on the foresail. 

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