As a sailor, i have to recommend brands like Sail Racing, Slam, Musto, Helly Hansen and Zhik.

They all make jackets for casual wearing, while using the absolute best materials on the market.

We're talking windproof, waterproof and breathable jackets which will keep you warm and dry even though they might seem like they're thin.

Some of them might be on the pricier side (especially Sail Racing) but it's absolutely worth it.

I've been wearing the same Slam jacket for the past 6 years and its still good as new. My dad has had a Helly Hansen jacket for nearly 20 years until it finally gave out. Since then, he got himself a Zhik jacket and has been wearing it daily for 7 years now.

Now you just gotta find a store in your country that specializes in sailing equipment lol.

Other than that, Napapijri is a great option since I've got one of their jackets too and I'm quite happy with it!