Happiness comes from accepting the bodies we have been given as divine gifts and enhancing our natural attributes, not from remaking our bodies after the image of the world. The Lord wants us to be made over—but in His image, not in the image of the world, by receiving His image in our countenances (see Alma 5:14, 19).
The scriptures declare that the body is a temple. It was Jesus Himself who first compared His body to a temple (see John 2:21). Later Paul admonished the people of Corinth, a wicked city teeming with all manner of lasciviousness and indecency: “Know ye not that ye are the temple of God, and that the Spirit of God dwelleth in you? If any man defile the temple of God, him shall God destroy; for the temple of God is holy, which temple ye are” (1 Cor. 3:16–17).
What would happen if we truly treated our bodies as temples? The result would be a dramatic increase in chastity, modesty, observance of the Word of Wisdom, and a similar decrease in the problems of pornography and abuse, for we would regard the body, like the temple, as a sacred sanctuary of the Spirit. Just as no unclean thing may enter the temple, we would be vigilant to keep impurity of any sort from entering the temple of our bodies.
Likewise, we would keep the outside of our bodily temples looking clean and beautiful to reflect the sacred and holy nature of what is inside, just as the Church does with its temples. We should dress and act in ways that reflect the sacred spirit inside us.
Do everything you can to make your appearance pleasing, but the minute you walk out the door, forget yourself and start concentrating on others.
Quotes from a talk given by Susan S. Tanner: read it here.