I made this with a Haruhi Suzumiya I made last year. I sewed a strip gold fabric into a tube and slipped it on a plastic headband. I sewed another strip of gold fabric into a tube and ironed it flat to make a ribbon. The I wrapped red ribbon around the headband. The I tied the gold and red ribbons around one side and let them hang.
I'd wear this to every Quidditch match and I also wore it to the midnight showing of Harry Potter and the Deathly Hallows Part II.