'Breastplates' in the Bible

From that day on, half of my servants carried on the work while half of them held the spears, the shields, the bows and the breastplates; and the captains were behind the whole house of Judah.

They had breastplates like breastplates of iron; and the sound of their wings was like the sound of chariots, of many horses rushing to battle.

And this is how I saw in the vision the horses and those who sat on them: the riders had breastplates the color of fire and of hyacinth and of brimstone; and the heads of the horses are like the heads of lions; and out of their mouths proceed fire and smoke and brimstone.