I think we'd all love to know the history of every piece of flying kit we own (if only the item could talk!)
Even if one could take a finger print off an item, that would never prove ownership. Items many decades old would be handled by many people.
The only sure way of knowing detailed provenance of an item is if the item came directly from the original owner or a third party who could be trusted to convey the "story" from the original owner.
The other way is if one can see a name in a piece with a service number. But this can be faked. I have flying helmets and goggles with names and numbers that I am certain are names of the owner(s). One day I will take a day off to go to the Public Records Office and look up these people.
As for the value of the suit - yes, if I put the suit up for sale, I could be surprised. But it won't be for sale, at least not for the forseeable future.