The High Priest...of Israel...had two sets of garments. The most elaborate were those worn in his daily administrations. This set of garments consisted of a breastplate, an ephod, a robe, a broidered coat, a mitre, and a sash, plus a simple undergarment. (Exodus 28:4,42)
The second set of garments were only used one day. New garments were made the following year for the next Day of Atonement. This set was comprised of a holy linen coat, linen breeches, a linen sash, and a linen mitre. (Leviticus 16:4)
You will notice that in either set of garments no footwear of any kind is provided, for this ground was holy ground. Moses at the burning bush had heard God's command. "Draw not nigh hither: put off thy shoes from off thy feet, fr the place whereon thou standest is holy ground." Exodus 3:5.
The set used for the day of atonement was plain without precious stones or gold embroidery It emphasized the righteousness of a Holy God. It is in these garments that the high priest is the nearest representation of Jesus Christ. The only gold is the plate fastened with blue lace to the mitre, or head cover. On this plate were engraved the words, "HOLINESS TO THE LORD" (Exodus 28:32)
The above is an excerpt from the book "The Law Prophesied", by R.H. Mount.