A navy crew-neck sweater and beige chinos matched together are a sartorial dream for those dressers who appreciate casual and cool styles. Ramp up this whole outfit by rounding off with black leather brogues. When leaves change color and autumn is in the air, you'll appreciate how perfect this getup is for summer-to-fall weather. As a 30-something Millennial man, you probably want to start dressing more maturely. In this case, getups like this are perfect as inspiration.