Darren, you can easily Google terrorists wearing burka to find some facts.

If they don't care about hiding their identity, I wonder why they like to run away after their attacks.  It would save the police in France, Belgium and Germany lots of time if they didn't all run away after their attacks.

As for sunglasses, baseball caps, balaclavas and motorcycle helmets?  When you show up at a government office, you are required to remove all those accessories for identification.  So, what's so special about the niqab and the burka where women do not want to remove it?