oh that’s gorgeous, I’m ordering! Thank you for sharing xAgreed, that would be my first stop.
Ilse Jacobsen is nice. And not designer but I have a Kin raincoat/parka from John Lewis and I've never had so many comments on a coat or had so many friends buy the same one. I absolutely love it - it's got a great shape and looks much more expensive than it was. Here's the (non aff) link, I have the olive green
Kin Oversized Parka, Khaki at John Lewis & Partners