Hard proof that a navy plaid gilet and navy jeans are amazing when matched together in a relaxed casual menswear style. For a classier spin, complete your outfit with brown suede casual boots. So when summer is done and fall is here, this ensemble has a good chance of becoming your number one. As a 30-something guy, you want to start dressing more professionally. In this case, combos like this prove useful as a source of inspiration.