Ephod

something girt, a sacred vestment worn originally by the high
priest (Ex. 28:4), afterwards by the ordinary priest (1 Sam.
22:18), and characteristic of his office (1 Sam. 2:18, 28;
14:3). It was worn by Samuel, and also by David (2 Sam. 6:14).
It was made of fine linen, and consisted of two pieces, which
hung from the neck, and covered both the back and front, above
the tunic and outer garment (Ex. 28:31). That of the high priest
was embroidered with divers colours. The two pieces were joined
together over the shoulders (hence in Latin called
superhumerale) by clasps or buckles of gold or precious stones,
and fastened round the waist by a "curious girdle of gold, blue,
purple, and fine twined linen" (28:6-12).

The breastplate, with the Urim and Thummim, was attached to
the ephod.