For an effortlessly smart menswear style, consider teaming a military jacket with a navy turtleneck — these pieces fit beautifully together. Finishing with a pair of white leather low top sneakers is a surefire way to infuse a more casual twist into this ensemble. So so as you can see, it's an on-trend, not to mention spring-ready, combo to have in your transitional rotation. Wondering how to nail casual style as you reach your 40s? This combo is a practical illustration.