1 Samuel 17:38

Saul armed David with his armour Not that which he was wont to wear himself, for he was so tall it would not have fitted David, but with armour taken out of his armory. The Hebrew word מדיו, madaiv, however, here rendered armour, more properly signifies his vestments, or his garments, and is so translated chap. 1 Samuel 18:4, and in most other places where it occurs. Indeed his armour is distinguished from this, and particularly described in the following words. He therefore, doubtless, speaks in this clause of some military vestments which were then used in war, and were contrived for defence, as buff coats now are.