An olive waistcoat and black jeans are surely worth adding to your list of closet must-haves. The whole look comes together when you introduce brogues to the mix.
Olive Waistcoat with Brogues Smart Casual Warm Weather Outfits
If you don't take your personal style lightly, go for a casually sleek menswear style in an olive waistcoat and olive cargo pants. Brogues complement this getup very nicely.