Hello, I am familiar with brigandines, but have never seen anything like this before. Is there any historical evidence that something like this existed?

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Yes, but not exactly.
First of all, Munchen type of brigantine is basically a cloth covered breastplate.

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Second, there are some paintings of the burgundian wars period that show some armours covered in cloth. But there's still two options - eather it can be brigantine or surcoat.
Still I like the variant of plates covered in cloth, it a practical thing when you are in the field for a lond time period and your armour rusts less.

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