This casual pairing of a black turtleneck and blue jeans is capable of taking on different moods according to how you style it out. Why not take a classic approach with footwear and complete this look with a pair of black and white leather brogues? As you can see, this combination is a really good pick, especially for awkward fall weather, when the temperature is dropping. This combo is probably exactly what you're looking for as a gent in his forties.