Islam is one even though these muttaween come up with these strange things and as you know always must be a proof from Quran or Prophet says but if you asked him about that I'm sure he doesnt has one, more than this the Shiekh who gave this fatwa can he force his wife and daughters to follow it nah I dont think so and for sure no one will force someone to follow it.

I think the problem is taking some cultural staff and make it as part of islam.