Wilson's Dictionary of Bible Types
Exodus 25:7 (c) This garment represents part of that wardrobe described in Isaiah 61:10 as the "garments of salvation." It was on this garment that the twelve stones were set in the breastplate and fastened to the garment. It may represent that part of our Christian experience in which and through which we show forth the virtues of our Lord JESUS CHRIST. The ephod contained gold, blue, purple crimson and cotton. These colors and materials represent the various and glorious characteristics of our Lord JESUS, and are imparted and imputed to us when we are made children of GOD. On the shoulder pieces of this garment were two large stones on which were engraved the names of the twelve tribes, six on each stone. All of this refers in some way to our Lord JESUS who carries us on His shoulders and on His breast.
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Watson, Walter. Entry for 'Ephod'. Wilson's Dictoinary of Bible Types. https://www.studylight.org/dictionaries/eng/wdt/e/ephod.html. 1957.