My Index costume was originally created for Anime Expo 2012. I was in California at the time staying in a small hotel room for about three months. Luckily, I got the fabric for the costume and sewed it with no more tools than what I had bought and my trusty sewing machine. However, as I hadn't sewn anything in several months by that point, I didn't measure out how much fabric I needed correctly (as the fabric was being split between two costumes). The fabric store was too far away for me to reach again, so I had to think up something quick! I ended up buying a pack of XL white shirts from a nearby store and used those to make the robe.
I think my favorite part of the costume are the giant safety pins! Plus it's probably the only time I could ever get away with safety pinning a costume together. (ﾉ◕ヮ◕)ﾉ*:・ﾟ✧
Anyway, I eventually wore this to both Anime Expo 2012 and Pro±Con 2013, the pictures come from the 2013 convention.