Matthew Poole and continuators on Exodus 28:27

27 And two other rings of gold thou shalt make, and shalt put them on the two sides of the ephod underneath , towards the forepart thereof , over against the other coupling thereof , above the curious girdle of the ephod.

To answer the two rings in the breast-plate, that by all these the breast-plate might be the better fastened to the Ephod.

In the lower part of the ephod, or in that part of it which is under the lowest part of the breast-plate.

Towards the breast.

(i. e.) Over against the ouches on the shoulder-pieces, where the upper part of the breast-plate was fastened to the Ephod.