For an outfit that's worthy of a modern trendsetting guy and casually neat, consider wearing a grey suit and a black v-neck t-shirt. When this outfit is too much, play it down by finishing with black leather slip-on sneakers. So if you're on a mission for a stylish yet mature ensemble, this one is great.
For a look that's pared-down but can be smartened up or dressed down in a multitude of different ways, consider pairing a grey suit with a black crew-neck t-shirt. If you wish to immediately dress down your outfit with footwear, complement your look with black leather slip-on sneakers. An outfit completely worthy of a 30-year-old's smart casual wardrobe.