If the setting permits a casual look, you can go for a charcoal blazer and cargo pants. You can get a bit experimental in the shoe department and class up your ensemble by slipping into a pair of burgundy leather brogues. As you see here, as a man in his 30s, you have a wide range of styling options.
Charcoal Blazer with Cargo Pants Casual Outfits In Their 30s
If you're scouting for a relaxed and at the same time dapper look, rock a charcoal blazer with cargo pants. Burgundy leather brogues will add an elegant aesthetic to the look. A good, less conservative outfit for maturing men.
To pull together a casual look with a modernized spin, make a charcoal blazer and cargo pants your outfit choice. A good, less conservative outfit for a 30-year-old gentleman.