A navy turtleneck and brown corduroy chinos are wonderful menswear staples that will integrate brilliantly within your current casual arsenal. Bring a laid-back touch to your look by rounding off with low top sneakers. As the weather turns cooler, you'll find that a look like this is ideal for fall. Those who are dubious whether you can still rock modern off-duty looks as you get into your 40s, this pairing should answer your question.