How would I move the ears of this hat?

Illidanstorm

I want to move the ears on this hat so they can go to the side and up and down. They don't have bones or anything.

It is from here https://www.daz3d.com/fg-gamer-outfit

fred9803

https://www.daz3d.com/mesh-grabber

Richard Haseltine

You could also add a bone foir each ear, or use a dForm with a weight map to restrict its effect to the ears.