Exodus 28:27-28

(27, 28) Two gold rings were also to be sewn on to the ephod, low down and in front, so as just to appear above the “curious girdle of the ephod,” and the lower rings of the breastplate were to be laced to these rings by a “lace of blue.” The breastplate was thus securely attached to the ephod, and showed above the “curious girdle” without covering it.