Weave the tunic of fine linen and make the turban of fine linen . . . Make linen undergarments as a covering for the body, reaching from the waist to the thigh. Aaron and his sons must wear them whenever they enter the Tent of Meeting or approach the altar to minister in the Holy Place, so that they will not incur guilt and die.
~ Exodus 28:39,42-43
The linen cloth worn by the priest symbolized his righteousness and his worthiness to enter God's sacred tent. Prior to dressing in the linen garments, they would wash their entire body as a rite of purification. The sacred linen garments made the priests holy as they worshipped the Lord.
We are also to be "clothed in righteousness" when we come to God in worship. This covering of righteousness comes in the form of our High Priest, Jesus Christ who is holy and pure. He does not have to offer sacrifices day after day as the Israelite Priest did though, because he has already offered up the ultimate sacrifice to once and for all redeem us of our sins.
All of us have become like one who is unclean, and all our righteous acts are like filthy rags;
~ Isaiah 64:6
All that we do, no matter how good, is no better than filthy rags in the sight of our Holy God. However, Jesus covers us in His garments, His Righteousness, so we can approach our Most Holy God.
Original post can be found here: The Tabernacle Experience