Obedience

Because the Bible teaches that Christian should rather beautify the inner man. Christian girls are more concerned about the inner qualities they must develop,  rather than the hairstyles they must have. Christian girls are aware that really good brothers are attracted to inner qualities more than the outward. 
Do not let your adornment be merely outward-arranging the hair, wearing gold, or putting on fine apparel-rather let it be the hidden person of the heart, with the incorruptible beauty of a gentle and quiet spirit, which is very precious in sight of God. 
                                         1 Peter 3:3-4

Obedience

life in Christ is by faith through which we are saved
When you received Christ you became a new creature cause all the past had gone away

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