C. F. Keil and Franz Delitzsch on Exodus 28:15-16

Exo 28:15-16

The second ornament consisted of the choshen or breastplate. Chosen mishpat, λογειο͂ν τῶν κρίσεωον (lxx), rationale judicii (Vulg.). חשׁן probably signifies an ornament (Arab. pulcher fuit; Ges.); and the appended word mishpat, right, decision of right, points to its purpose (see at Exo 28:30). This breastplate was to be a woven fabric of the same material and the same kind of work as the ephod. “Foured shall it be, doubled (laid together), a span (half a cubit) its length, and a span its breadth.” The woven cloth was to be laid together double like a kind of pocket, of the length and breadth of half a cubit, i.e., the quarter of a square cubit.