This combination of a navy raincoat and blue jeans is solid proof that a safe casual outfit can still look really interesting. You could perhaps get a bit experimental on the shoe front and complement your outfit with a pair of black suede monks. As you can see here, this look is a really wonderful choice, especially for transeasonal weather, when the temperatures are starting to drop. As a 30-something Millennial gent, you want to start dressing like an adult man. If that's the case, combos like this are ideal as inspiration.