You'll be amazed at how easy it is for any gent to get dressed like this. Just a cardigan paired with black sweatpants. For something more on the classy side to round off your look, introduce a pair of derby shoes to the equation. Keep this combo in your head come warmer weather, and we promise you'll save time racking your brain for what to wear on more than one morning. A fail-safe option pairing proper for gents in their 30s who prefer to dress casually.