There’s no reason we don’t have a definitive version yet. I’m talking about details down to the slanted waistcoat pockets, dotted pinstripe pants to scale, two swappable gold and silver pocket chains, accurate coat detailing with proper sleeve cuff buttons just to name a few.
I think this is what most of the conversation boils down to, and it's where most disagree with you.
There is no definitive version out there because (I believe) there is no such thing. You want perfection, but that doesn't exist. There are only approximations.
The only way to get a "perfect" 1/6 Joker suit would be to have exact 1/6 replicas of every type of string of fabric used for each piece of clothing, in the exact same color, which at the same time has the same reflective properties, and lay/drape that the 1:1 fabric has. And then it has to be stitched using 1:6 needles and sewing machines.
Since that's not possible (with current technologies), you need to make concessions. But what those concessions are down to personal preference. Is it the drape, is it the color, it is the exclusion of small details?
So a "definitive" version that's realistically attainable becomes subjective. And the only way to achieve that is by commissioning a one-off from a tailor who is both capable and willing to go down the same road and deliver *exactly* what you want.
To put this into practice: is there a single collectible out there, in any scale other than 1:1, of any character (iteration), that can be considered definitive? I would argue there is not.