While in LA we did a studio tour of Warner Brothers. Even though Harry Potter was not filmed in the US there was a lot of memorabilia on site from the movies include props and original costumes. Below the first article indicating Voldermort has returned!
Below are original professor costumes. The one of the left is the evil Professor Umbridge and the one on the right is Quirrel's robes and headpiece which Voldermort hid when he was part of the back of his head.
The red shirt was an outfit worn by Ron, The robes with the scarf were Hermione's and the far right were Harry's robes.
A number of different spell books from the movie.