God was particular on how the priest should conduct business, especially in the temple. He was even concerned with how they dressed and the specific fabric used; He wanted them to stay cool, so He told them to dress in linen so they wouldn’t sweat, and they were to change clothes before ministering to the people. Did you know that Adam and Eve didn’t sweat until after the fall? Sweating was a part of the curse. The priests were not to grow their hair long because it was feminine, but they were also not to shave it off but were to keep it short. They were not allowed to marry a widow unless she was the widow of a priest. God had His reasons for the many rules for His priests; He is holy and expects reverence and conformity when ministering to Him. Thankfully, as priests in the kingdom, we are sanctified by Jesus, and that is enough to minister to God. Jesus is the holy one; we are hidden in him, so God also recognizes us as holy. It is such a privilege to have Jesus as our Savior. Make sure you tell him how grateful you are for your salvation.
But ye are a chosen generation, a royal priesthood, an holy nation, a peculiar people; that ye should shew forth the praises of him who hath called you out of darkness into his marvellous light: 1 Peter 2:9
And it shall come to pass, that when they enter in at the gates of the inner court, they shall be clothed with linen garments; and no wool shall come upon them, whiles they minister in the gates of the inner court, and within. Ezekiel 44:17