From the YouTube description:
From ancient times, men and women have embraced sacred music, different forms of prayer, religious vestments full of symbolism, gestures and rituals to express their innermost feelings of devotion to God.
The variety of these forms of expression is as wide and diverse as the human family. Yet all have the same ultimate purpose: to connect the believer with the object of their devotion in the most personal way—to draw close to God.
Temple garments are worn by adult members of The Church of Jesus Christ of Latter-day Saints who have made sacred promises of fidelity to God’s commandments and the gospel of Jesus Christ.