I found an American Red Cross shirt from the Goodwill for a dollar. I figured it would be perfect in an ironic way seeing as it advertised donating blood. I cut some slits in the shirt, as well as cut off the collar and parts of the sleeves. I then took scissors and cut little slits to make the edges of the collar and sleeves look ragged. If you have any 80's metal fans, chances are they have a shirt already prepared in their closet that you can possibly borrow. Lastly, I took some fake blood and splattered it onto the shirt and pants, and threw in some hand prints. Other ideas are to roll around in the dirt, hose it down, or lend it to your friend who never showers.