A breastplate or chestplate is a device worn over the torso to protect it from injury, as an item of religious significance, or as an item of status.
Breastplate and helmet of the French Horse Carabinier, during the Bourbon Restoration (1816–1824)
New-made replicas of a 17th-century helmet, two breastplates, tassets, a halberd, and two military marching drums
Man's Breastplate, Crow (Native American), 1880–1900, Brooklyn Museum
A cuirass is a piece of armour that covers the torso, formed of one or more pieces of metal or other rigid material. The word probably originates from the original material, leather, from the French cuirace and Latin word coriacea. The use of the term "cuirass" generally refers to both the breastplate and the backplate pieces; whereas a breastplate only protects the front, a cuirass protects both the front and the back of the wearer.
An Ancient Greek bronze cuirass, dated between 620 and 580 BC
Indian steel cuirass, 17th to 18th century
M1872 helmet and M1855 cuirass worn by the French cuirassiers