A white crew-neck t-shirt and grey chinos are a pairing that every modern guy should have in his off-duty collection. Demonstrate your sophisticated side by finishing with a pair of navy leather loafers. Undoubtedly, it's easier to work through a blazing hot day in a summery look such as this one. Wondering how to nail smart outfits as you cruise through your 20s? This pairing is a vivid example.