Why not reach for a grey gilet and a brown turtleneck? As well as totally practical, both pieces look amazing when paired together. This one is a viable idea when it comes to crafting a knockout look for awkward fall weather. A no-brainer for 30-something gentlemen scouting for a more professional image.
When comfort is a must, this pairing of a grey gilet and a brown turtleneck is always a winner. You can get a bit experimental in the shoe department and complement this look with dark brown athletic shoes. This one is a wonderful option if you're picking out a well-coordinated ensemble for transeasonal weather. Guys who are curious how to wear modern casual style well into your 30s, this pairing should answer your question.