Exodus 28:30 says, And thou shalt put in the breastplate of judgment the Urim and the Thummim; and they shall be upon Aaron’s heart, when he goeth in before the LORD: and Aaron shall bear the judgment of the children of Israel upon his heart before the LORD continually.   The Urim and Thummin, which were used to determine God's will were to be in the breast plate.  Verse thirty-nine states, And thou shalt make the robe of the ephod all of blue.  Verse thirty-two adds, And there shall be an hole in the top of it, in the midst thereof: it shall have a binding of woven work round about the hole of it, as it were the hole of an habergeon, that it be not rent.  These are instructions for the robe for Aaron.  Verse thirty-three states, And beneath upon the hem of it thou shalt make pomegranates of blue, and of purple, and of scarlet, round about the hem thereof; and bells of gold between them round about:  Verse thirty-four adds, A golden bell and a pomegranate, upon the hem of the robe round about.   Verse thirty-five continues, And it shall be upon Aaron to minister: and his sound shall be heard when he goeth in unto the holy place before the LORD, and when he cometh out, that he die not.  The bell was to used so that the people knew when Aaron went into the holy place.  Verse thirty-six declares, And thou shalt make a plate of pure gold, and grave upon it, like the engravings of a signet, HOLINESS TO THE LORD.  They were to make a golden plate engraved with HOLINESS TO THE LORD.  God will never allow His holiness to be forgotten, especially when we come before Him to worship.  Verse thirty-seven says, And thou shalt put it on a blue lace, that it may be upon the mitre; upon the forefront of the mitre it shall be. Verse thirty-eight adds, And it shall be upon Aaron’s forehead, that Aaron may bear the iniquity of the holy things, which the children of Israel shall hallow in all their holy gifts; and it shall be always upon his forehead, that they may be accepted before the LORD.  Aaron was to wear this when he went before God on behalf of the people of Israel.  Verse thirty-nine states, And thou shalt embroider the coat of fine linen, and thou shalt make the mitre of fine linen, and thou shalt make the girdle of needlework   Then verse forty states, And for Aaron’s sons thou shalt make coats, and thou shalt make for them girdles, and bonnets shalt thou make for them, for glory and for beauty.  Different garments were to be made for Aaron's sons.  Though they were to be priests, there was to be only one high priest.  Today, we as followers of Christ are a part of the priesthood of believers, but there is but One High Priest, and that is Jesus Christ.  Verse forty-nine declares, And thou shalt put them upon Aaron thy brother, and his sons with him; and shalt anoint them, and consecrate them, and sanctify them, that they may minister unto me in the priest’s office.  Aaron and his sons were to be anointed and sanctified as priests so they could minister to God.  We today as Christians are consecrated by the blood of Christ so that we can do the work of God in the world.  Verse forty-two says, And thou shalt make them linen breeches to cover their nakedness; from the loins even unto the thighs they shall reach:  Then, verse forty-three concludes, And they shall be upon Aaron, and upon his sons, when they come in unto the tabernacle of the congregation, or when they come near unto the altar to minister in the holy place; that they bear not iniquity, and die: it shall be a statute for ever unto him and his seed after him.  Aaron and his sons were not to come into the tabernacle or near the altar with sin in their lives.  I believe that this would be known, unconfessed sins, and the same applies to us today.