A grey horizontal striped crew-neck t-shirt and olive chinos are indispensable menswear staples if you're putting together a casual wardrobe that matches up to the highest sartorial standards. For something more on the smart end to finish this outfit, complete this look with a pair of burgundy leather loafers. This combo isn't a hard one to nail and it's summer-friendly, which is more important when it's super hot outside. This getup illustrates that as a 30-something gent, you have a wide range of sartorial options.