My daughter wanted to be Raven for Halloween and of course it's one of the ones not available in stores. Made everything except pants and leotard.
For the cloak and shoe covers: I bought fabric and doodled a template. Measured my munchkin and got sewing. The cloak is double layered for sturdiness and warmth.
Belt/gems: For the life of me, I couldn't find large enough red gems. I ended up buying mosaic tiles and painting the flat side red. The "gold" that holds them is just painted hot glue. With the short time and lack of money, I couldn't find anything better.
I think it turned out alright and she adored the whole thing.