If it's comfort and functionality that you're seeking in an outfit, consider teaming a denim shirt with a white crew-neck t-shirt. Let your outfit coordination sensibilities truly shine by complementing this ensemble with white canvas high top sneakers. This combo should clear any doubts you had about dressing casually in your thirties.
This casually cool ensemble is really pared down: a denim shirt and a white crew-neck t-shirt. Go ahead and introduce a pair of beige suede sandals to the mix for an element of stylish nonchalance. Ideal to show people that you're mature and confident enough to own your sartorial choices.
Dress in a denim shirt and a white crew-neck t-shirt for both seriously stylish and easy-to-achieve outfit. On the footwear front, this look is finished off nicely with white leather low top sneakers. Gentlemen who are curious how to rock edgy casual outfits as you mature into your 30s, this combination should answer your question.