For refined style with a twist, you can rely on a waistcoat and a light blue long sleeve shirt. We're totally digging how complete this outfit looks when finished off with a pair of dark brown leather loafers. Undoubtedly, it's easier to work through an extremely hot summertime afternoon in a light and breezy outfit like this one. All in all, a fail-safe choice when it comes to dressing ideas for 30-something guys.