This is irrefutable proof that a grey cardigan and black jeans look awesome when worn together in a contemporary outfit. White low top sneakers are a fail-safe way to give a sense of stylish effortlessness to this look. Keep this outfit in your front hall closet when spring arrives, and rest assured, you'll save a ton of time racking your brain for what to wear on more than one morning. Casual combos for stylish 20-year-old guys aren't actually that hard, as you can see here.