He dressed smart, carried a knife and wound up in jail. As his life story hits the stage, Riaz Khan reveals how, in 1980s Britain, soccer violence was very multiculturalIt wasn't so much the violence that attracted Riaz Khan to football hooliganism as the clothes. In the early 1980s, Khan became a casual " a new breed of thug that took pride in wearing the latest designer gear. He was one of the first Asian hooligans…