This is a great example of casual dress attire. This gentleman sports a straw trilby hat tilted back on his head, and a navy, deep v cardigan over a lightly checked, white shirt. His pants are straight leg khakis, complimented by a charcoal pair of docksiders.
The red pinstripes on the trim of his cardigan are a great detail. He does a great job carrying the navy throughout the outfit, on his hat band, tie and cardigan. The rolled up sleeves with the shirt cuffs out is definitely a nice touch.