How do cars receive elite design status?

What’s the criteria for that?

I might be mistaken but a car that has a livery on it by an elite painter, and if that livery was not shared by the painter (making it 1 of 1) would get that status.
At least that’s what i concluded

I’ve got bamboozled. Paid several millions of credits for a car with an elite design just to realize that the livery is available for free in the design browser.

But that doesn’t matter anyore, I’ve sold the car for the same price I bought it for.

Minus the auction fee, 10% I think?