This casual combo of a dark brown long sleeve shirt and navy jeans comes in useful when you need to look dapper but have no time. Our favorite of a myriad of ways to finish this look is black leather brogues. So if it's a roasting hot warm weather day and you want to look sharp without putting too much effort, this look will do the job in no time. All in all, a goofproof option when it comes to style for guys in their 30s.