I've sewn a lot with reflective tape and piping as well. It's really fun, but also hard to find and expensive when you do. The best thing seems to be finding it locally at a remnants or overstock warehouse.

Vajrana, you should note that it will NOT "glow" much on the playa (I'm assuming "we got our tickets" refers to burning man). it's reflective not illuminated, which means it only works with a direct light source shining on it. It looks great in photographs shot with a flash or direct bulb. But keep in mind that out in the desert the most you get is some low firelight or someone's occasional flashlight. So if you're basing your decision on the pictures you've seen of costumes made with the reflective piping, keep in mind the glow effect looks better in the photo than it will in person most times. As I said, unless you're going to be walking around under a bright light source or continually roving light (like in a nightclub), you won't get that glow.

I say this from experience. I have a jumpsuit that has reflective piping and reflective tape, which I've worn it to the playa. Think of it this way, it's more like wearing something shiny, like something silvery (a foil or lame` shirt) -- it'll bounce off some ambient light, which is cool. but it's not like you're actually glowing.

If want something that will be bright all the time you need to use something like EL wire. That will require a power source (battery), some minor soldering, and some research.

good luck. :)