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 priest’s robe, a striking blue, served not just as a fashionable statement but carried deep spiritual significance. In ancient Israelite culture, blue was often associated with divinity and the heavens. The color wasn’t just for aesthetics; it represented the sky and thus the connection between God and His people. Blue in biblical texts is frequently linked to revelation and God’s laws—a fascinating nod to the heavenly origins of the commandments given to Moses.

Moreover, the similarities between the priestly garments and what was worn by Christ at the crucifixion echo powerful theological ideas. In John 19:23, the seamless robe of Jesus signifies the unbreakable unity between God and humanity. That connection is enhanced when we observe that the garments of the priests were designed to symbolize their role as mediators between the divine and the people.

Fun fact: the biblical instruction to use blue also influenced ancient dyeing techniques, as getting the brilliant hue from the murex shell represented effort and artistry. So, while back then the dear citizens of Israel celebrated after sunset, looking skyward was also a reminder of their obligations towards a wide spectrum of devotion. These threads in fabric tell tales of responsibility, sacrifice, and bridging human experience to the divine plan. It's more than wardrobe choices; it's legacy, where every color buzzes with intricate spiritual stories!