I think it's a good idea, however I have next to no sewing skills. I've never been in any cosplay contests cause all of my cosplay is bought or just slightly tweaked.
Same here, most of my cosplays were pieces of just the right clothes and stuff. Though I only never entered a cosplay contest because I was afraid I'd never stand a chance to win. Most of the time preparing for K-con '08 I had no one else but myself to do it, or be in my skit.
I don't know how many more DragonBall fans are left out there...compared to Kingdom Hearts,Naruto, Bleach, and Death Note. Most of which I never seriously watched on TV/played or have money to buy the DVDs. I don't know enough about the more popular series to be able to base cosplays off of them, and the older series such as DragonBall and Inuyasha are apparently outdated. What's an old fan to do?
And so, except for sewing a patch onto a denim jacket, I really don't have anything I could bring to have worked on.