A black crew-neck sweater and beige chinos are the kind of a foolproof casual ensemble that you need when you have no extra time to spare. Complement your ensemble with a pair of black leather sandals to keep the look fresh. Casual outfits for gents in their 30s aren't actually that hard, as you can see here.
If you prefer laid-back combinations, why not take this combination of an olive denim shirt and beige chinos for a walk? Finishing off with black leather sandals is an effective way to inject an air of stylish casualness into your outfit. All in all, a great example of casual style for men over 30.
Putting together a light blue denim jacket with beige chinos is an on-point choice for a casually dapper getup. Make this look less formal by rounding off with black leather sandals. Those who wonder how to wear cool off-duty outfits in your 30s, you have your answer.