Man, they sell those studded belts at Walmart. You could probably take an old belt, cut it down and burn designs into it.
Cut leather lengths from an old belt(or again just buy the shit at wally world) abd string metal charms on it.
Black cotton can be altered with different concentrations of bleachwater for specific designs like skulls and gas masks and pentagrams and shit. Just paint the bleach on with a paintbrush for more precision. Or just do tie dye.