This laid-back pairing of a navy plaid long sleeve shirt and a white crew-neck t-shirt is a surefire option when you need to look sharp but have no time to assemble a look. To bring a mellow feel to this getup, complete your ensemble with tan leather work boots. With rising temperatures come warmer days and more sunlight and the need for a kick-ass outfit just like this one. Those who are curious how to sport modern off-duty style as you head into your 30s, this outfit should answer your question.