I went as Snape this year. I had wanted to do something HP-related for years, but I never had the chance until now. My family had a surprise costume party for my uncle, who was born on Halloween, and we also passed out candy downtown for trick-or-treaters. I
forced convinced my family members to dress up as some of the other characters... Unfortunately I have no pictures of everyone together because they didn't want to end up on the Internet, but here's my costume:
I made the jacket myself, and most of the rest is just random articles of clothing I already had. You can't see all of it in these pictures, but I had black pants and black Oxfords. I actually found the white shirt at Goodwill for about two dollars, but the collar worked out really well. Here's a close-up of it:
I ended up just using a cheap Halloween wig for the hair; I thought my real hair would be just a few inches too long but the wig photographed oddly well and a few people who only saw my costume online couldn't tell the difference. That was a little awkward.