|Schott black pea coat|
So something which could just about pass in a formal setting as long as nobody looks too closely but which also works casually would probably be a good idea. This is why I'm considering a pea coat. I have no idea where the term 'pea coat' comes from but this new one from Schott (pictured) has the right air for smart casual but isn't going to look desperately out of place over smarter clothes. (Of course it won't stand up to close scrutiny but that's not such an issue for very occasional wear). It's also just about short enough not to scrunch up when you're driving.
I've no idea who stocks these things but the RRP is £170.
What's everyone else getting..?