This combo of a blue plaid flannel long sleeve shirt and a white crew-neck t-shirt is proof that a pared down casual ensemble doesn't have to be boring. If you want to instantly tone down this outfit with shoes, why not complete your getup with a pair of tan leather work boots? We love that this combination is great when warmer days are here. Laid-back looks for men over 30 aren't actually that hard, as you can see here.