I saw this jacket and was wondering what the characters above the logo mean?
They are the words 無政府. 無 means "without" or "absent of", while 政府 means "government". So literally, 無政府 means "without government". Note that this does not necessarily carry as strong of a connotation as "anarchy", although that is indeed often translated as 無政府狀態 (literally: "state of no government").