This pairing of a short sleeve shirt and a dark green crew-neck t-shirt is solid proof that a pared down casual getup doesn't have to be boring. Black leather derby shoes are a fail-safe way to breathe a hint of refinement into your look. Naturally, it's easier to work through an extremely hot warm weather day in a breezy look like this. If you're often not sure how to dress age-appropriately but also look stylish, this outfit is a practical illustration.