Exodus 28:6

The ephod— The high-priest's garments are first described, the outermost of which was the ephod or super-humeral; which was a kind of close garment or short vest without sleeves, which hung behind upon the back and shoulders, and came down before upon the breast, somewhat in the nature of our heralds' robes. It was joined by two shoulder-pieces; and this, which was appropriated to the high-priest, was made of fine linen embroidered with gold, blue, purple, and scarlet: the ephods worn by the common priests were made with linen only; see 1 Samuel 2:18; 1 Samuel 22:18.