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, noted for its vibrant blue hue, holds deep symbolic meaning within the story of Exodus. This color was not just arbitrary; blue often represents divinity and heaven in biblical texts. In ancient Israel, it’s believed that blue dye was made from a rare sea creature, cuttlefish or a special type of murex snail, which added to its value and significance. Everything about the attire showcased a connection to the divine—calling attention to the idea that priests were intermediaries between the people and God.

This garment catches our view again when we look at the New Testament, where it echoes through the robe worn by Christ at the crucifixion. In John 19:23, soldiers notice His garment, remarking on its seamless design, perhaps paralleling the unity and completeness of Christ's mission. It’s interesting to think that a priestly outfit leading the people back to God's commandments finds a reflection in the persona of Christ, illustrating a continuum in the representation of divine mediation through cloaks of authority.

Furthermore, blue is traditionally associated with loyalty, wisdom, and trust; qualities necessary for priesthood and conducive to leadership. In connecting threads through different Bible chapters, these garments continue to remind us not only about divine service but also the fidelity required of us as individuals in our relationships and endeavors. Every stitch and every shade matters!