breastband vs breaststrap

breastband

noun
  • A strophium: a band worn around the breasts. 

  • A band of canvas, attached to a ship's rigging, that provides support for the man heaving the lead in heavy weather. 

breaststrap

noun
  • An oblong application supporting the mammaries of a human female 

  • A piece of horse tack for preventing the saddle from slipping backwards. 

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