How would I dress up as Luna Lovegood from Harry Potter?!

How would I dress up as Luna Lovegood from Harry Potter?

I'm going to a midnight release, and I want to dress up as Luna Lovegood, without buying the robes or anything. Please Help?

1 week ago
I decided to wear what she's wearing in the Dumbledore's Army Picture, but what shoes should I wear?

Hopefully you have long blond hair already, because that is a must and some crazy earrings. It would be really cool if you could make a replica of the Quibbler to hold upside down too!