A duffle coat and a white and navy crew-neck t-shirt are a pairing that every stylish guy should have in his off-duty fashion mix. If you need to effortlessly dress down your outfit with a pair of shoes, why not add white leather low top sneakers to the equation? A great illustration of transeasonal fashion, this look is ideal this spring. And if we're talking casual dressing ideas for maturing gentlemen, this getup is perfect.