breastplate vs breaststrap

breastplate

noun
  • A piece of horse tack designed to prevent the saddle slipping backwards. 

  • A piece of armor that covers the chest. 

  • A piece of silicone in the shape of women's breasts worn by drag queens and other female impersonators to simulate a female body shape. 

  • An embroidered square of linen worn on the breast of the Jewish high priest, bearing twelve precious stones, each inscribed with the name of one of the tribes of Israel. 

breaststrap

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

  • An oblong application supporting the mammaries of a human female 

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