A black polo neck sweater and black skinny jeans are must-have menswear essentials if you're crafting a casual wardrobe that holds to the highest fashion standards. For something more on the smart end to round off your outfit, add brogues to the equation. This one is an appealing pick if you're hunting for a knockout look that transitions easily into fall. As a 20-something heading into your 30s, this is how you dress as a grown-up.