The priestly garments were considered a part of the work of the Tabernacle.

...........The robes of the High Priest express the functions of the High Priest.

...........................The materials are specified, gold and fine twined linen; the others, blue, purple and scarlet, are colors emblazened upon the fine twined linen and everywhere interlaced with gold.

"And they did beat the gold into thin plates, and cut it into wires, to work it in the blue, and in the purple, and in the scarlet, and in the fine linen, with cunning work."
........................Exodus 39:3