There is nothing better than a minimalist look. So get rid of the make-up, and stick to the powder and lip gloss. Slap on your jeans, a loose white blouse (or just a plain top, but the loose blouse makes it look slightly more delicate), and some fine jewelry to fit this look. Their hair should be quite basic too. A simple blow dry once you have washed it, and leave it loose all day. This is also great if, like me, you are growing your hair out. It lets it breath, and keeps the damage to a minimal.
The key to making this look work is keeping it very basic. Not bright or bold patterns, or chunky boats. Small pearls and simple jacket finish the look and give it a very Chanel look.