Have you considered commissioning it?
If you're only after the coat, it shouldn't be terribly expensive...and...depending on what area you live in...the option would be available to have a lighter weight fabric that still looks good...but...minimizes you having a heat stroke.
But...maybe that's just me ^^;
"People do not care. If you cannot keep up, you will lose everything."
“It’s not how tragically we suffer, but how miraculously we live.”
~Tea is wisdom, just add water~