breastplate

noun5

1. •
   A piece of armor that covers the chest.
2. •
   A piece of armor that covers the torso; a cuirass, the breast- (front) and back-plate, taken together as a unit.

   • He wears a Thracian-style helmet that protects most of his head and face, and a breastplate or "cuirass" covering his back and chest, both made of bronze. — 2002
3. •
   (Judaism) 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.
4. •
   A piece of horse tack designed to prevent the saddle slipping backwards.
5. •
   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.