We've been looking for a coat for the missus for some time now, tried various places but not seen anything suitable without a silly price tag, so I thought I'd open it to the hivemind and see if any of you lovely folks could help.
For reference, Vanessa Ives from Penny Dreadful:

Something in this style but a bit longer this would be ideal. Size-wise around a UK 16 or 18 as the missus is tall, nearly six feet, and quite broad in the shoulder so she needs the bigger size to get the shoulder width and arm length.
Here's a picture of the missus in her 'Gal Capone' garb, to give you an idea of her build:

I know we could get one made, but she really doesn't want to spend bespoke money on something she's only going to wear a couple of times a year.
Any assistance on this seemingly impossible task would be most appreciated.