handkerchief vs head covering

handkerchief

noun
  • A piece of cloth, usually square and often fine and elegant, carried for wiping the face, eyes, nose or hands. 

  • A piece of cloth shaped like a handkerchief to be worn about the neck; a neckerchief or neckcloth. 

head covering

noun
  • A covering for the head. 

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