This is quoted directly out of the ensign, the official magazine of The Church of Jesus Christ of Latter-day Saints.
"There is, however, another piece of armor worthy of our consideration. It is the special underclothing known as the temple garment, or garment of the holy priesthood, worn by members of The Church of Jesus Christ of Latter-day Saints who have received their temple endowment. This garment, worn day and night, serves three important purposes: it is a reminder of the sacred covenants made with the Lord in His holy house, a protective covering for the body, and a symbol of the modesty of dress and living that should characterize the lives of all the humble followers of Christ.
It is written that �the white garment symbolizes purity and helps assure modesty, respect for the attributes of God, and, to the degree it is honored, a token of what Paul regarded as taking upon one the whole armor of God (Eph. 6:13; cf. D&C 27:15). � Garments bear several simple marks of orientation toward the gospel principles of obedience, truth, life, and discipleship in Christ.� "
Carlos E Asay
Read the whole article
here