Beat 's outer trappings -- black turtlenecks , cigarette pants , neckerchiefs , berets -- is indebted less to Jack Kerouac and his wayward cohort , who slouched about in frayed flannel shirts , than to stylized interpretations in movies like '' Funny Face '' or the less well-known '' Subterraneans , '' a 1960 film based on a Kerouac novel about the kinky denizens of North Beach in San Francisco .