For something on the semi-casual end, you can opt for a navy tweed blazer and grey shorts. Tone down the casualness of this getup by finishing with white leather derby shoes.
Navy Tweed Blazer with Grey Shorts Smart Casual Outfits For Men
Wear a navy tweed blazer and grey shorts if you're going for a proper, dapper ensemble. On the shoe front, go for something on the smarter end of the spectrum with white leather derby shoes.