Exodus 28:4
2-5. holy garments—No inherent holiness belonged either to the material or the workmanship. But they are called "holy" simply because they were not worn on ordinary occasions, but assumed in the discharge of the sacred functions (Eze 44:19).
for glory and for beauty—It was a grand and sumptuous attire. In material, elaborate embroidery, and color, it had an imposing splendor. The tabernacle being adapted to the infantine aid of the church, it was right and necessary that the priests' garments should be of such superb and dazzling appearance, that the people might be inspired with a due respect for the ministers as well as the rites of religion. But they had also a further meaning; for being all made of linen, they were symbolical of the truth, purity, and other qualities in Christ that rendered Him such a high priest as became us.Zechariah 3:5
5. And I said—Here the prophet, rejoicing at the change of raiment so far made, interposes to ask for the crowning assurance that the priesthood would be fully restored, namely, the putting the miter or priestly turban on Joshua: its fair color symbolizing the official purity of the order restored. He does not command, but prays; not "Set," but "Let them set." Vulgate and Syriac version read it, "He then said," which is the easier reading; but the very difficulty of the present Hebrew reading makes it less likely to come from a modern corrector of the text.
angel of . . . Lord stood by—the Divine Angel had been sitting (the posture of a judge, Da 7:9); now He "stands" to see that Zechariah's prayer be executed, and then to give the charge (Zec 3:6, 7).