It shall have two shoulder pieces attached at two of its corners, so it can be fastened.
Directions are here given concerning the ephod, which was the outmost garment of the high priest. Linen ephods were worn by the inferior priests, Sa1 22:18. Samuel wore one when he was a child (Sa1 2:18), and David when he danced before the ark (Sa2 6:14); but this which the high priest only wore was called a golden ephod, because there was a great deal of gold woven into it.
Commenting on Exodus 28:6-14
It shall have the two shoulder pieces thereof,.... Which were two pieces that joined to the ephod, reaching from the arm holes to the shoulders both on the right and left, coming from before and behind; and meeting on the shoulders, were buttoned with two onyx stones, and covering the shoulders are called by this name: joined at the two edges thereof; the two edges...
Exo 28:6-14 The first part mentioned of Aaron’s holy dress, i.e., of the official dress of the high priest, is the ephod. The etymology of this word is uncertain; the Sept. rendering is ἐπωμίς (Vulg. superhumerale, shoulder-dress; Luther, “body-coat”). It was to be made of gold, hyacinth, etc., artistically woven, - of the same material, therefore, as the inner drapery and curtain of the tabernacle...
Commenting on Exodus 28:6-14