I've been working on my niece's costume all day. She's going as Hermione. Instead of getting some far-too-expensive cheap-ass Hogwarts robe, we got a reaper cloak and I modified it. Cut it down the middle of the front so that it hangs open, I hemmed one side and part of the other by hand, and attached buttons and a loop of piping to make a clasp. Making our own was cheaper.