For a look that's worthy of a modern sartorial-savvy guy and casually classic, choose a grey puffer jacket and a black crew-neck sweater. Let your styling credentials really shine by finishing this getup with a pair of black leather low top sneakers. As the temperature lowers, you'll discover that an ensemble like this is perfect for autumn. Gentlemen wondering how to wear edgy off-duty style in your 20s, this pairing should answer your question.