I think they would wear anything especially if there about to sneak into another country
A facial mask, of course.
a terrorist can wear anything!
One thing that always bothered me about the 9/11 hijackers were their bandannas. I admit it is just a little detail but these things look more like "Broke Back Mountain" than "Executive Decision." Oh well, I guess any port in a storm, right?
http://www.vaed.uscourts.gov/notablecases/moussaoui/exhibits/prosecution/PA00111.jpg