Why did they have to introduce that as what the natives wear to keep cool. In the desert sun being covered fro head to toe is the best, actually though she would wear something with a long skirt to keep herself cool like the men's kandura, or the algerian karakou(had to google for the name) or even a kaftan would have been better.
But I guess fan-service is a must and most won't care about the inaccurate representation of middle east