I second the buying a backup camera. With two- you not only have a back up, you now have 72 frames before a reload, and/or you can have two different stocks loaded at one time. One black and white, one color....or whatever.
As for the batman utility camera belt idea- I've made one of those for my Bronica, yes you look a little strange (I ceartainly feel strange when I wear it) but it is nice to have.
And I dont know if they are still available now, but I remember seeing ads for formal dress vests that were made for wedding photographers. They were photo vests designed to go with your tux.
Try this site http://www.buy.com/prod/ador-tuxedo-...211118720.html