That's Magneto's helmet, the one he wears to keep psychics like Professor Xavier from tampering with his mind. Is that enough to count for the East Meets West pool and cosplay tags?

I don't think you need the cosplay tag, since, well, she didn't wear it.

I'd say it fits East meets west as well as clever, since she blocks mental out

It's only "clever" if you're using it for something that people wouldn't normally think of using it for. That helmet (at least, in the movies,) was introduced explicitly for saying "Get out of my head, Charles!"