This is indisputable proof that a dark green bomber jacket and a turtleneck look amazing when teamed together in a casual ensemble. For something more on the daring side to complement your getup, complete this look with a pair of dark brown leather work boots. This is a fail-safe option for a kick-ass outfit that will take you from winter to spring. Ideal if you're searching for some seriously inspiring style for 40-year-old gentlemen.