Nobody gets to wear hats at all (unless it's one of the special occasions, like Spirit Week, school spirit days, religiouscommercial holidays like Christmas or VDay, your birthday [as long as it's a birthday hat], Special Dispensation Days, you're performing in something [whether a play or just a presentation], it's for an athletic team, your name is Fred, or you're human, at the discretion of the admininstration).

It's "religious headgear," meaning yarmukahs (sp? and am I thinking of the right word?) or scarves and the like. My guess is that it would have to be a "mainstream" religion anyway.