Make your costumes as easy or as hard as you like.
Think about how your zombie died......
Run over by a car? Grab some paint to make site marks.
Opportunity or Second hand shops are a great
For kids, clothes that they are growing out of or are damaged make fantastic zombie costumes
Scissors make great holes and cuts in fabric. Quick unpick or seam ripper create great tears and wore and torn looks.
Coal and black paint make awesome additions to any zombie costume