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The cheapest place for colorful fabrics by far is Ikea (at least in my city). So, I purchased the fabric, took about 6 hours of planning and sewing (didn't really have a pattern... just kind of made it up as I went).
Turned out rather nice. It wasn't expensive - cost me about 180 kr (roughly $25, but it's probably even cheaper in the US). Below is my makeshift pattern. I based it off of this. Here are the measurements I used and how I did it. I kind of eyeballed the measurements, so it's not exactly as that, but I tried my best to remember the measurements for the instructions.
Obviously, one can go longer and multiple layer it, but I have to make 4 costumes for my friends and simplest is best. Hope someone tries this (but not in my city :D). It's going to be an awesome Halloween."