“McSally was represented by the Rutherford Institute in her successful 2001 lawsuit against the Department of Defense, challenging the military policy that required US and UK servicewomen stationed in Saudi Arabia to wear the body-covering abaya when traveling off base in the country.”
I remember that case. From McSally's Wikipedia entry (boldface added, LOL!):
Critics of the policy noted that while female military personnel had been required to wear the abaya, the situation was not the same for "women diplomats" assigned to the US Embassy in Riyadh, who were actually encouraged not to wear the abaya when they were involved in official business, "because they are representing the United States."
The DoD was definitely the ass in that affair, and a law was actually passed making it illegal for DoD to require the abaya or use taxpayer funds to buy it.