If the situation allows a relaxed ensemble, marry a long sleeve shirt with jeans. You could perhaps get a bit experimental in the shoe department and lift up your ensemble by rocking black suede brogue boots. A practical illustration for any gent who's not sure how to dress after 30.
For comfort dressing with a fashionable spin, consider teaming a long sleeve shirt with jeans. A pair of brown suede desert boots will pull the whole thing together. This combo shows that in your 30s you have a wide range of sartorial options.
A long sleeve shirt and jeans are a combination that every modern gentleman should have in his off-duty closet. Demonstrate your elegant side by finishing with a pair of brown leather brogues. This pairing demonstrates how guys in their thirties kill in the style department.
If you're looking for an off-duty but also sharp look, dress in a long sleeve shirt and jeans. For shoes, stick to the classic route with white canvas oxford shoes. As a guy in his 30s, you probably want to start dressing maturely. If that's the case, outfits like this come in very useful.
A long sleeve shirt looks especially nice when paired with jeans. Dark purple leather loafers are guaranteed to bring a touch of elegance to your getup. A safe bet for young guys searching for a more professional image.