To create a casual look with a modern spin, try teaming a white long sleeve henley shirt with black chinos. Boost the formality of your look a bit by wearing black leather casual boots. All in all, an ideal demonstration of casual fashion for guys in their thirties.
This combination of a white long sleeve henley shirt and black chinos spells comfort and relaxed casual cool. A cool pair of white leather low top sneakers pulls this ensemble together. This getup illustrates that in your 30s your outfit options are looking great.