Black t-shirts and jeans are not the only things your characters have to wear. Don't know how to come up with designs? I'm sure you don't only wear tees and pants (If you do, well I"m sure you hang out with other people that don't) so think of your characters the same way. You don't need a fashionista to design the wardrobe for your comic.
Panel room for interactive workshop and class style events, including make-up fx, cosplay, crafts, voice acting, and other participation-based stuff.