"When we dress for attention, we are not inviting the Spirit to be with us. We act differently when we are dressed for the world’s attention. [. . .] We show love and respect to the Lord through humble dress and behavior."
-Elder Robert D. Hales
You should strive to look your best. Be neat and clean. Keep your clothes clean, mended, and pressed. Clean and polish your shoes regularly. Bathe, shave, and brush your teeth each day. Use deodorant, and wash your hair frequently.