A shawl cardigan and blue jeans are among the crucial elements in any guy's versatile casual arsenal. Complete this outfit with a pair of charcoal plimsolls to tie the whole outfit together. When you're having one of those dull autumn days, sometimes only a neat ensemble like this one can get you to face the outside world. Those wondering how to pull off modern off-duty style as you head into your 30s, you have your answer.