Or you could just let your dog play with the shirt, assuming you have one (a dog, I mean). Or, I wonder if using coarse sandpaper would help degrade the material. Hmm. You could probably find something about "weathering" fabric with a google search.
What I'm dying to know is how you will get the big spikes in your cranium without becoming a Halloween fatality. I was thinking how shops sell those arrows or blades that are connected to a headband thing, so it looks like you've been stabbed in the head. I wonder if they have that sort of thing for spikes...
actually i did have an idea for the spikes... glasses i was going to take the lenses out create some pikes and glue them to glasses... but i just didnt have the time.. i was given liek a 2 day notice that i was going to a halloween party which is tonight.. so the spikes will have to wait till next year( we want to try again next year with some advanced planning.)