Christians should always use the Bible as a guideline for how they represent themselves. Scriptures tell us God’s true Christians are the light of the world (Math. 5:14), and as such are ambassadors for God in conduct and appearance.
Looking to scripture, there are three principles which can applied when selecting clothing:
1) Is it modest apparel? (1 Timothy 2:9). Christian women should never wear clothing that might be arousing to the opposite sex. This includes miniskirts, overly revealing bathing suits, and dresses that expose cleavage or are too tight. These are not appropriate — their intent is to cause arousal, which does not express good taste or wisdom.
Modest apparel should also not reflect extremes in fashion. Tongue and nose rings, excessively high heels, an inordinate amount of jewelry, overly baggy pants and outlandish hairstyles all reveal an attitude of immodesty. On the other hand, clothing which goes against all conventions of style would also be a wrong extreme. The Christians’ life should be one of balance and moderation, never (Philippians 4:5).
2) Is the clothing of good quality? Being modest does not mean we have to dress in a drab fashion. Rather, we should maintain high standards by buying the highest-quality clothing within the limits of what we can afford. Being a light to the world means setting an example for others to follow. Therefore, our clothing should be sharp, reflect balance and good taste.
3) Is it appropriate for the occasion? A formal dinner requires a different outfit than a more casual event, to avoid standing out. In addition, many denominations allow people to attend services dressed any way they want. So one will come in shorts, while another wears jeans or coverall. Casual clothing is never the standard God expects from His true adherents at Church services — after all, they are appearing before the God of the universe.