This is precisely the kind of filmy, semi-transparent breeze of a dress you might wear to frolic in a meadow on a fine summer’s eve.
That is, if you are shooting a commercial for Summer’s Eve. Most other people visiting Morocco, as Eva is, would be like, “Dude, my crotch is one frisky ray of sunlight away from becoming a public figure,” and put on something else. Maybe Eva heard the words “Marrakech film festival” as “Massengil field test,” and assumed that piece of gibberish meant she was one audition away from being one of those celebs (like Pitt and Clooney) who rake in a fortune in ads that never air in the U.S. Oh, Summer’s Eva. Awkward.