This is because we are in a country in which the society is very conservative, at least in the Arab areas. It is not acceptable for people over 16 years of age to wear shorts, and girls can not be dressing in very short skirts, nor can they be tight. We have had guests here at the college who were not aware of these issues and ended up having problems due to dressing in tight jeans and tight shorts, or shorts of any kind. This issue is not to be taken lightly. All clothing must be neat and tidy.
Skirts covering the knees or dressy pants, including jeans, are fine.
Pants should not be tight or ripped. It is also recommended that a rather loose fitting longer blouse be worn, short sleeves are fine, but sleevless shirts are not. To wear sneakers or shoes is fine, but be prepared to have at least a couple of dressy outfits, because it is very possible that you could be invited to a wedding, engagement or other special occasion. Of course, no clothing should be so light that it is see threw. Inside of your house, you can dress as you like, if living with the group or on your own, but outside of your house is something else.