Pay separately
You have to pay separately for it. I think it was $12 per person.
The Disney exhibit is a separate cost. The front desk will direct you on how to join the virtual waitline. It uses an online platform that you can check to see where your wait is. The exhibit is really neat, so get there early to get in the queue.
The Disney costume exhibit is an upgrade charge. The city pass covers general admission to the museum, and you'd pay the extra dollars per person to do the special exhibit.
Thanks! Your answer is awaiting moderation.