You'll be surprised at how easy it is for any man to get dressed like this. Just a white long sleeve shirt worn with khaki chinos. For something more on the smart side to finish this look, complement this getup with dark purple leather derby shoes. Semi-casual ensembles for stylish 30-somethings aren't actually that hard.
A white long sleeve shirt and charcoal chinos will allow you to demonstrate your sartorial side. If you need to immediately up this ensemble with one item, why not finish off with a pair of dark purple leather derby shoes? All in all, a fail-safe choice when it comes to dressing ideas for gentlemen in their 30s.