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Seasoned zombies don’t wear brand new clothes, so you’ve got to make your clothing look old to be authentic. There are a few ways to do this with common household items.  Use a spritz bottle filled with water and a few drops of brown or black food coloring, coffee, or black tea to make your clothes look old. This works best on lighter colors to make clothing seem dingy, dirty, and worn.   Spritz your clothing unevenly to make it look more realistically aged. Use a 1:1 bleach solution to "fade" clothing. Zombies stand out in the sun, so clothes fade and look old. This is a good approach to make darker colored clothes look worn out. Zombies stumble around catching themselves on things, so to make it realistic tear up those clothes. Add some tears into your clothing with a seam ripper or knife or running a grater over areas. Don’t be afraid to also use your hands to tear at some small cuts.  To make your tears look realistic, cut in random areas and vary the size of the cuts and the amount of fraying. Remember that your clothing will need to stay on your body, so don’t get too carried away with the ripping and tearing! Keep the tears PG-13 Take your clothes outside and rub them around in the dirt and mud to get that grimy zombie look down for your clothing. Add mold to your clothes by mixing up some liquid latex and oatmeal and letting it dry on your clothing.  If you’ve got time in advance you could always bury your clothing outside for a week.  You can find liquid latex at any costume store, a basic superstore, or online. Zombies are all about blood and gore, so add some to your clothing to help add to the effect. Use store bought blood or make your own, and then spatter it all over your clothing using your own hands and sponges.  Make sure to step away from your clothing to see how it looks at a distance.  An easy do-it-yourself recipe for fake blood is combining corn syrup with a few drops of red food coloring. Then add a squirt of chocolate syrup to thicken and darken the blood. Using extreme caution, take a lighter to your clothing to singe or burn parts of it to achieve that zombified look.  Do not burn your clothes while they are still on your body.  You should always do this in an open area away from flammable surfaces and have a fire extinguisher nearby.

Summary:
Fade and/or dingy your clothing. Tatter your clothes by ripping and tearing them up. Grime up your clothes with dirt and mold. Add blood to your clothes. Singe and sear your non-flammable clothes very carefully.