Effortlessly blurring the line between dapper and off-duty, this combination of a turtleneck and a long sleeve shirt can easily become one of your go-tos. On the shoe front, this getup is finished off nicely with dark brown leather casual boots. With rising temperatures come warmer days and more sunlight and the need for a killer look just like this one. On the lookout for fashion for 40-year-old gentlemen? This pairing is great inspiration.