How can I dress up as Hermione Granger?

I'm going to the 7th Movie: Part 2 Midnight Showing with my friends
and we're all dressing up. I'm going to be Hermione, and I need some
little things about her that can help the costume.

I know things like bushy hair and a wand, but what are some little
things that can help??
like for example a S.P.E.W badge...

Thanks and any little thing helps! :)