Role Playing Games are a great way to generate ideas for stories, artistic projects, and costumes. Last summer I played in a home brew game with some of my girlfriends who wanted to girls only game. We settled on a super hero setting and went on to tell a tale of heroic deeds and comic antics.
My character was the Avant Guard, who had come to own a magical set of paintbrushes from ancient China that let her manipulate the world around her. Formally an artist, she was determined to make her whole super hero career into a performing art piece. One of her first ventures as part of a super hero team was to design costumes for all of her colleagues. With nothing better to do I went ahead an drew out the costumes.