So at the top of my list of anime-series-I-have-finished-watching-but-really-should is Nodame Cantibile, which for anyone who hasn't seen it is a "josei" anime (anime targeted at women over 20) about the lives of students at a music college. It's from the studio that made Honey and Clover, which more of you may recognize.
I have yet to see (or find?) a Nodame Cantibile cosplay. This is largely because the characters wear different clothes everyday -- so few anime do this. It makes it difficult to recognize a character through costume.
However, a few things are recognizable: their concert outfits, their hair, and their instruments. For instance, I've been thinking of doing something like Chiaki, on the right in this image.
Unsurprisingly, the girls have it slightly harder since women's dresses tend to look slightly different whereas men's formalwear usually contains common components like pinstrip jackets and white dress shirts. But still, the clothes are a lot more realistic, so that means at the very least there will probably be a useful pattern somewhere.
I have a wig that might work for Chiaki. He also has a conductor's outfit that involves a white bow tie. Add a conductor's baton and he'd be at least moderately recognizable, doubly so next to a good Nodame with sheet music or a mini-piano.
This may be a pretty toned-down cosplay idea, but I think the josei/seinen anime needs some love. Is anybody else interested in Nodame?