The answer is: Blue

Exo 28:31 - the middle garment, beneath the ephod and above the coat, made from one piece of fabric and similar in design to the robe Christ was wearing at the crucifixon (John 19:23)

Isn’t it interesting how colors in the Bible are not just for decoration, but carry deep significance? The priest's robe, being blue, is quite evocative. In ancient Israel, blue represented the heavens and godly authority, reminiscent of God's throne and heavens above. It creates a visual connection between the earthly priests and divine service.

Now, thinking about what that color signifies expands our understanding of many biblical themes. For instance, when we consider Jesus' robe at the crucifixion, it brings to mind how that garment, too, connects to that heritage of righteous service and sacrificial love. When the soldiers cast lots for it, the text sharply contrasts the divine purpose of the robe with the grim reality of crucifixion, highlighting how sacred roles were sadly twisted by human actions.

In Jewish tradition, blue is also linked with the commandment to wear tzitzit—fringes on garments—where blue thread reminds people of the law and the heavens. Now that’s a multisensory tie between practical fashion and spiritual lessons, isn’t it?

The unmistakable echo of moments like these lives through scripture—we see God's design, pouring through every element. It’s as if God scattered the little threads of meaning across the works, subtly connecting dots from priestly duties to the ultimate sacrifice of Jesus. Who knew colors could weave such powerful tapestries of faith, right?