This pairing of a crew-neck t-shirt and jeans is proof that a safe casual outfit can still be really interesting. To add more class to your ensemble, finish off with a pair of brown leather brogue boots. That's the style for a 30-year-old gentleman to convey he has what it takes to succeed.
This combo of a crew-neck t-shirt and jeans is extremely easy to throw together and so comfortable to sport as well! Shake up this look by finishing off with black leather chelsea boots. This outfit is most probably exactly what you're looking for as a 30-something man.
If you're seeking to take your casual game to a new height, wear a crew-neck t-shirt with jeans. Add a sleeker twist to an otherwise mostly casual outfit by slipping into black suede casual boots. You can take inspiration from combinations like this if you've passed the big 3-0 and you want to take a more serious approach to your personal style.
Try pairing a crew-neck t-shirt with jeans, if you enjoy relaxed dressing but would also like to look stylish. To add some extra classiness to your outfit, introduce black leather casual boots to the mix. No doubt, a good option if we're talking fashion for 30-something guys.
For an outfit that's pared-down but can be manipulated in a myriad of different ways, pair a crew-neck t-shirt with jeans. Complement your outfit with dark brown leather double monks to completely shake up the getup. A solid ensemble to uphold a mature image.