balmoral vs thigh boot

balmoral

noun
  • A heavy walking shoe. 

  • A Scottish cap with a flat top and a plume but no brim; a blue bonnet. 

  • A figured woollen petticoat. 

  • An Oxford shoe. 

thigh boot

noun
  • A boot that rises as high as the wearer's thigh. 

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