Is first green head band ever she wore correct grammar?

No, that sentence has several grammatical errors. Here's a breakdown of the issues and how to fix them:

Issues:

* Missing subject: The sentence starts with "first green head band ever she wore," but there's no clear subject doing the action. We need to know *who* wore the headband.

* Article usage: "Head band" should be "headband" (one word).

* Word order: The phrase "ever she wore" is awkwardly placed.

Corrected sentences:

* If we know who wore the headband: "This was the first green headband she ever wore."

* If we don't know who wore the headband: "The first green headband was worn by someone."

Let me know if you have more questions about grammar!