For an outfit that's super easy but can be modified in a great deal of different ways, rock a blue long sleeve shirt with jeans. When not sure about the footwear, go with beige suede desert boots. And if we're talking casual outfit ideas for gents in their 30s, this look is perfect.
Try teaming a blue long sleeve shirt with jeans for a comfy ensemble that's also well-executed. Level up this ensemble with the help of a pair of brown leather chelsea boots. A solid combo to demonstrate the world your newfound maturity.
Rock a blue long sleeve shirt with jeans for a simple outfit that's also put together. Wear this pairing when you want to project a more mature image.
If you would like take your casual game up a notch, pair a blue long sleeve shirt with jeans. A cool, less conservative combination for a 30-something Millennial gentleman.
This off-duty combination of a blue long sleeve shirt and jeans is a fail-safe option when you need to look nice but have zero time to craft a look. As you go into your 30s, you want to start dressing more professionally. In this case, combos like this are a safe bet.