Pair a white long sleeve shirt with a short sleeve shirt to feel 100% confident in yourself and look casually dapper. Dial up your whole outfit by finishing off with white athletic shoes. Relaxed outfits for stylish men over 30 aren't actually that hard, as you can see here.
Why not wear a white long sleeve shirt with a short sleeve shirt? As well as super practical, both items look amazing worn together. When not sure as to the footwear, complete this getup with brown suede boat shoes. This pairing shows how to keep killing it in the casual fashion department as a 30-something man.