About Mormon Underwear
If you look at a pair of garments, there is nothing physically special about them. They are made from a variety of light-weight fabrics, and most garments are white. (There are some special colored garments that can be worn by members of the armed services, but for the vast majority of Mormons, garments are always white.) The white color symbolizes purity and the length and cut of the garment helps assure modesty in dress and appearance. The garment bears several simple marks related to gospel principles of obedience, truth, and discipleship in Christ.
The meaning attached to the garment by devout Mormons transcends the fabric and design used to create the garment. It is sacred to the wearer not for what it is, but for what it represents. It reminds the wearer of the continuing need for repentance and obedience to God, the need to honor binding covenants voluntarily made in the temple, and the need to cherish and share truth and virtue in our daily living. By so doing, the garment helps the wearer to focus his or her life on Jesus Christ and to thereby lay claim on the blessings promised to those who do so.
For more information, check out Mormon Underwear (from lightplanet.com)