Well, I'm not from Indiana, but I go to college 9 months out of the year, so I figure I'm there more than back here in Ohio (leaving tomorrow, actually...). My sis has a job in Indiana now, too, but while she likes cosplaying, I make the costumes. ^_^;;
Last year, 7 of us from our anime club cosplayed from One Piece for Ohayocon, but I think that was more due to the fact that I told them it was fun and they should do it too, heh. Oh, and I go to Anderson, which is only about 45 minutes from Indianapolis, and there is actually a costume shop and JoAnn's about 5 minutes away from campus, thankfully. Comes in quite handy. ^_^;; Not to mention a really nice Goodwill, heh.
And I do believe there is an Indiana con starting up in 2006 called Amerikon, or something like that, but it's in Columbus, Indiana. And there used to be C-kon in Fort Wayne, but it was so small, it ran into money problems and is no longer around. Indiana really needs a good con...
Costumes I'd like to make in the near future:
Chris (Obstinate Arrow uniform), Scrapped Princess - 75% done
Robin V/Damian Wayne, Batman comics
Prince Alexander, King's Quest VI - 75% done