Why not pair a charcoal biker jacket with a crew-neck sweater? As well as super functional, these items look awesome when teamed together. Take a more relaxed approach with shoes and introduce a pair of black canvas high top sneakers to the equation. There's no nicer way to brighten up a gloomy fall day than a sharp ensemble like this one. This combo proves that slipping into your 30s is no reason to avoid casual outfits.