For something on the semi-casual side, consider this combo of a navy bomber jacket and a dress shirt. You could perhaps get a bit experimental in the footwear department and tone down this outfit by finishing with white low top sneakers.
Navy Bomber Jacket with Dress Shirt Casual Warm Weather Outfits For Men
A navy bomber jacket and a dress shirt are an easy way to introduce some manly sophistication into your day-to-day casual arsenal. Go ahead and add navy and white athletic shoes to your outfit for a more relaxed vibe.