It's just good practice to mix patterns on the weekend, especially gray days without quite enough light to photograph well. Here, a green broken herringbone tweed is overchecked in red, orange and blue. It's combined with a pink and blue checked shirt worn pinned, a burgundy on brown club necktie, and a silk paisley pocket square with a blue ground.
Tweed dressing and pattern mixing go hand in hand. And the act of working off one's urges for complex combinations makes work day dressing in simpler patterns that much easier to accomplish.