:lol:
I've done this before to mow the lawn...I've got some wicked allergies, and it does wonders to keep the pollen out of my nose and mouth.
Also, some terrorists use that as a quick and easy way to mask themselves. Plus, after they've done their dastardly deeds, they can wear the shirt over the shirt they wore earlier to help disguise themselves in their getaway. Unless they were stupid enough to wear the same color shirt.
And they probably are.
Cthulhu