Inverness Cape?

[Pleater]

Are you aware of anyone who makes Inverness Capes (or Coachman's Cloaks) who would be capable of following those recommendations? I imagine the Coachman's Cloak would be bigger challenge, since it has actual sleeves

You'd need to be clear what you actually want made,
To me a coachman's cloak is the garment with multiple tiered short shoulder capes intended to protect a driver perched up on the box out in all weathers - there was a cartoon of the Duke of Wellington - I think it was, wearing one - it was definitely insulting, being way below his station. I would expect inbuilt sleeves with deep buttoned cuffs which could be drawn down over the hands and refastened to protect the hands and arms - the reins would be drawn inside the sleeves through the slit where a couple of buttons were left undone.

The more upper class Inverness, Ulster and the like with the cape sleeves or outer cape you could have made to your own requirements unless you wanted something very specific to a particular character or date/location.

The number of people able or willing to undertake such work is limited these days - the political situation where certain things are taxed when they cross borders doesn't help at all. The actual construction of garments is not that difficult if you can make a trial attempt, called a toile, and fit it, or find a suitable pattern - there are many more costume and experimental garment patterns available there days.

Actually I have a pattern I first used way back - probably in the 1960s and 70s, just by the desk at the moment. I'm not recommending trying to find it - it is an antique after all but I'll see if I can photograph and upload it here- the front and back of the envelope, so you can see what it entails.
I started sewing garments for dollies almost 70 years ago, - my photo is rather out of date - but the hair is still the right colour. I can make just about anything from any era, having done re-enactment for English civil war, various costumes, morris kit - but it can't be beyond the wit of man or woman to set to and make stuff again. It used to be the only way to separate the soft layer from the gravel.
Right - first I need to find something to create a digital photo.

Anne the Pleater