Warm and waterproof AND stylish winter coat?

[rumtumtugger]

Please recommend me a coat that is properly warm (eg down), and actually waterproof, with a hood, that won't make me look frumpy or mumsy. I'll be carrying dd in a sling so non-bulky would also be an advantage but not a deal-breaker. Happy to spend up to £150 if necessary!

Oh - and I get cold thighs so covering my bum is a must, and up to knee length would be ideal. Thanks!

MaM coat

I used this in a cold northern country and was warm, looks decent too, plus you can carry baby inside with the panel added (zips on either on the front or back). It has a hood, and is waterproof.

Ooh wasn't expecting to find something that was sling-ready! What is the sizing like? I'm a 10-12, should I get xs or s?