cuirasse means “breastplate” | MotiTan French Dictionary

More examples

Après la rupture, il s'est créé une cuirasse pour ne plus montrer sa peine.

After the breakup, he built himself a suit of armor so he would no longer show his pain.

One solid protective plate covering the chest, like a hard shield worn on the front of the body.

armure: Protective armor made of metal or leather and worn over the body.
gilet pare-balles: A vest worn to protect the body from gunfire.

Objet ou plaque protectrice portée sur le torse, historiquement en cuir puis souvent fabriquée en métal.

The French word cuirasse comes through Old French from cuir, 'leather', a word descended from Latin corium.

For a modern bulletproof vest, French normally uses gilet pare-balles rather than cuirasse.