I think for a rain jacket you have to compromise on the performance. It'll be a bit heavier, maybe just water-resistent and not waterproof, and likely expensive

I think for a rain jacket you have to compromise on the performance. It'll be a bit heavier, maybe just water-resistent and not waterproof, and likely expensive. E.g. https://www.manufactum.co.uk/mens-parka-etaproof-a66808/ https://www.manufactum.co.uk/mens-parka-etaproof-a66808/ is just 7oz, but very expensive (but is rainproof). The densely woven fabric is key.