Exodus 28:6-8

and they shall make the ephod of gold and blue, purple, and scarlet fabric and fine twisted linen, skillfully woven and [beautifully] worked. It is to have two shoulder pieces joined to its two [back and front] ends, so that it may be joined together. And the skillfully woven sash, which is on the ephod shall be made of the same material: of gold, of blue, purple, and scarlet fabric and fine twisted linen.