If you're on a mission for a relaxed but also stylish getup, marry a navy open cardigan with a white crew-neck t-shirt. You could perhaps get a bit experimental in the footwear department and lift up this ensemble by finishing off with a pair of brown suede desert boots. If it's one of those gloomy autumn days, what better to spice it up than a on-trend getup like this one? Now that's a look that's bound to make you stand out among other 30-something gentlemen.