ExXB
From what I've heard and read this is much more to it than simply a head scarf, it's not just about what is worn on the aircraft and I'm not at all convinced this is the same as Saudi.
It seems from both the French media and the syndicats (Unions) that AF management have instructed that whenever a female crew member
leaves their hotel room during the Tehran slip they must wear a scarf and wear suitably formless/opaque clothing to hide their form......
Desserte de Téhérant : Revendication de l'Intersyndicale PNC | SNPNC
I know Saudi rules are tough on female crew members but don't recall there being similar rules
inside the Saudi hotel we used as crew the last time I was there. I wonder if this is down to the fact that as I understand it Iran has been pretty much closed to foreigners for years and at the moment there are no "western friendly" hotels.