This combo of an olive suit and a brown overcoat couldn't possibly come across as anything other than seriously stylish and refined. You can go down a more casual route on the shoe front by sporting loafers. As you can see here, this combination is a really nice choice, especially for transeasonal weather, when the temperature is dipping. This getup is most probably exactly what you're looking for as a gent over 40.
An olive suit looks so polished when worn with a dark green turtleneck. Introduce loafers to this ensemble and you're all done and looking awesome. This one is a viable choice if you're on a mission for a knockout summer-to-fall ensemble. This ensemble illustrates that dressing cool as you slip into your 40s is not particularly hard.
An olive suit looks especially classy when married with a mustard crew-neck sweater. Loafers pull the getup together. We promise this combo is the answer to all of your transeasonal wear problems. This pairing is a striking illustration men in their forties can very well kill in the style department.