In dress, as in all things else, it is our privilege to honor our Creator. He desires our clothing to be not only neat and healthful, but appropriate and becoming. CCh 180.1
We should seek to make the best of our appearance. In the tabernacle service God specified every detail concerning the garments of those who ministered before Him. Thus we are taught that He has a preference in regard to the dress of those who serve Him. Very specific were the directions given in regard to Aaron's robes, for his dress was symbolic. So the dress of Christ's followers should be symbolic. In all things we are to be representatives of Him. Our appearance in every respect should be characterized by neatness, modesty, and purity. CCh 180.2
By the things of nature [the flowers, the lily] Christ illustrates the beauty that Heaven values, the modest grace, the simplicity, the purity, the appropriateness, that would make our attire pleasing to Him.260Child Guidance, 413 CCh 180.3