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)

The striking blue of the priest's robe wasn’t just a fashion choice; color in the Bible holds symbolic weight, and blue often represents heaven, spirituality, and divine revelation. When you picture the High Priest Aaron in his vibrant attire, it's more than a colorful outfit—it's a testament to his sacred role and a reminder of the deep connection between the divine and the earthly.

Interestingly, when we see Jesus during his crucifixion wearing a robe, it echoes the robe described in Exodus. In both instances, these garments highlight the transition between different phases of worship and sacrifice. Aaron standing in for the people before God and Jesus embodying that ultimate sacrifice offer layers of meaning that span generations.

There’s also a fascinating rabbit hole here! The dye used for creating blue fabric—the famed “Tyrian purple”—was labor-intensive because it was made from sea snails. This not only signifies wealth but directs us towards reflections on the value of what we hold precious in our worship and lives today.

So, whether you're drawn to the colors of worship or the fabrics of biblical history, these intricate details show that even a robe can be woven with profound lessons about faith, sacrifice, and connection to something greater. Isn't it compelling how these ancient texts are stitched into the fabric of our understanding and connection?