Reach for a beige plaid long sleeve shirt and navy cargo pants for an off-duty look with a modern twist. Finishing with a pair of high top sneakers is the most effective way to infuse an easy-going touch into this getup. You're guaranteed to always look stylish even despite the scorching heat if you keep this getup in your front hall closet. Casual combos for stylish 20-year-old guys aren't actually that hard, as you see.