Shorts are not recommended because of Arab customs. This would be offensive to them. Your work clothes will get so dirty that you will likely trash them at the end of the program. Socks take the worst beating. White socks will turn brown, or worse, by the end of the season.
Some students like to wear bandannas for protection from dust on the tell.
You will do considerable kneeling, generally from four to six hours a day in a square, so you might want to consider knee pads, which you can find in any Home Depot or garden center. You will do well to find your work clothes at a Good Will or Salvation Army store. These are essential even for those with the toughest hands. The gloves should be sturdy but flexible, and you will probably go through two or three pairs. Those with leather palms and ventilated backs are ideal.