Is it from SS? I think I have the same or atleast a very similar from Suitsupply. It looks great on you, and perfectly styled like that. A double breasted jacket is often regarded as more formal, but with some texture, a soft construction and leaving it opened, it can often work even better than a single breasted jacket for a casual outfit in my opinion.I have a very similar jacket (double breasted, peak lapel, with that horizontal ribbed pattern), and it works really well casually. Shown below, with one where you can better see the texture. It’s a very casual jacket and I often reach for it more than the traditional navy blazer. I almost never wear it closed even though it’s double breasted because the voluminous lapel roll really nicely and create a really nice effect on their own.
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