If you love classic combinations, then you'll appreciate this combo of a red and black check flannel long sleeve shirt and a black crew-neck t-shirt. Get a bit experimental on the shoe front and add tan suede casual boots to the equation. If it's one of those dull autumn days, what better to brighten things up than a on-trend ensemble like this one? Wondering how to perfect casual dressing as you move into your 30s? This combination is the perfect answer.