Exodus 28:42
And thou shalt make them linen breeches to cover their nakedness; from the loins even unto the thighs they shall reach: And thou shalt make them linen breeches to cover their nakedness; from the loins even unto the thighs they shall reach:
Exodus 28:42 belongs to God's specific and detailed instructions for the priests' garments, given to suit their sacred service. It specifically prescribes linen breeches to cover nakedness, reaching from the loins even unto the thighs. Priestly dress for ministry before God was thus to be orderly and modest, appropriately covering the body, and neat and pure, for God requires order in everything connected with His service and especially cleanliness.
The prescribed clothing and such care in clothing and cleanliness taught that God is holy and His service is sacred. Those who approach Him must be clean and must honor His holiness, putting away impurity and uncleanness. The apparel of those who officiate before God honors or dishonors Him. The detailed directions for Aaron's garments show that dress in God's service mattered and that his clothing was symbolic; likewise the clothing of Christ's followers should represent Him by remaining neat, modest, and pure rather than changing merely to follow fashion or display vanity.