EL Wire is your best friend. Seriously. Our local grocery chain started selling these "Glowbrightz" kits in the bike accessory section. You can also order parts and cut your lengths and whatnot pretty easily.
In this instance, I didn't have time to wait for the shipping, so Glowbrightz it was!
I'm using a knit hood, for ease of attaching the EL Wire. Its also very easy to sew onto things too. In this case, the hood is removable. Knit things make it really easy to attach the wire because you don't necessarily need to sew anything.