I will have to assume he is dressed in patched bell bottoms, Nehru jacket, bandana headband and carrying a lit bong. Here is a photo of him.
RT @tomtomorrow: James O'Keefe reportedly at Liberty Park, this is what he looks like. http://www.zimbio.com/... #OWS pass it on
H/T to Lineatus:
BEWARE of This Man:
Go beyond the fleur de Kos for more photos of JOK in costume.