This combination of a black shirt jacket and a beige plaid flannel long sleeve shirt is irrefutable proof that a straightforward look can still be really interesting. Why not complement this outfit with a pair of black leather derby shoes for a dose of polish? This ensemble is a pretty smart choice, especially for autumn, when the temperature is getting lower. As you're heading into your 30s, you want to start dressing more like a mature gentleman. In this case, inspiration like this comes in very handy.