A black duffle coat and navy jeans worn together are a perfect match. Get a little creative on the shoe front and tone down your ensemble by slipping into navy canvas high top sneakers. So so as you can see, it's a killer, not to mention spring-friendly, combo to have in your seasonal sartorial arsenal. Off-duty outfits for stylish men in their thirties aren't actually that hard, as you can see here.
When the setting permits a casual outfit, go for a black print crew-neck sweater and navy jeans. A great pair of navy canvas high top sneakers is the most effective way to power up your getup. Keep this look in your front hall wardrobe when spring sets it, and rest assured, you'll save a lot of time trying to pick out an outfit on more than one occasion. This combination shows that as a gentleman in his thirties, you have a wide range of styling options.