The perfect choice for effortlessly classy menswear style? A grey wool blazer with a navy and white print long sleeve shirt. Make a bit more effort now and complete this outfit with a pair of navy suede oxford shoes. This combo is probably what you're looking for as a man in his thirties.
A grey wool blazer and a navy and white print long sleeve shirt work together smoothly. Why not take a classic approach with footwear and introduce a pair of black leather brogue boots to your ensemble? Ideal to portray that you're mature and confident enough to own your sartorial choices.