I don't see a thing at all unreasonable about this request. None whatsoever.
Nor do I. This seems like a textbook example of reasonable accommodation for a religious practice. They're still wearing a uniform, yes? They can still perform the job while wearing the uniform, yes? Seems like a win-win to me.
If the women requesting this accommodation had been Orthodox Jews or conservative Christians who don’t believe women should wear pants, the response they would have gotten is “Sure, no problem, but we’d appreciate it if your skirts could be the same color as the uniform pants”, and the “story” would never have made it into the media. Given that there are plenty of Muslim activities and requests that really are dangerous and unreasonable, the motives of anybody who tries to make an issue out of something like this are highly suspect.