This pairing of a shirt jacket and a navy and white long sleeve shirt is definitive proof that a safe ensemble can still be extra stylish. Don't know how to finish off? Complement your look with a pair of navy suede low top sneakers to jazz things up. This combination is a viable option if you're picking out a standout ensemble for weird transition weather. Gents who wonder how to wear cool casual dressing in your thirties, you have your answer.