I spent 20 minutes this afternoon doing precisely that.
1. Take one ordinary shirt. Bought this from H&M yesterday for £15
2. Some press studs/ spikes (can be bought here).. and embelish to your heart's content.
3. Walk around with some slashed tights and shades, feeling totally punkrock.
There's a fire burning, not too far from here. Out on the East Coast maybe it resides in you my dear