Why not consider teaming a dark green short sleeve shirt with a crew-neck t-shirt? As well as totally practical, these items look awesome when teamed together. You could perhaps get a bit experimental in the shoe department and play down your ensemble by finishing off with a pair of white and black athletic shoes. This combo is a viable choice when it comes to crafting a well-coordinated look for weird transition weather. Casual looks for stylish middle-aged gentlemen aren't actually that hard, as you can see.