This thread has dragged me out of lurking:) I used to live in SA. Ok, I was a kid at the time, but a remarkably feminist and somewhat observant kid, so an awful lot of conversations were had on the subject of women's rights/subjugation.
IMO, Michelle Obama was right not to wear a hijab. It isn't/wasn't in the least bit disrespectful.
From Bonsoir:
" If she goes to Saudi Arabia she should respect the laws and customs of the country she is visiting and cover her head. "
It isn't a law, and none of the foreign women wore headscarves while we were there, although most did wear abayas in public. Not all Muslim women wore headscarves, either - for instance there has been an awful lot of fuss over the years about presenters of Arabic TV shows showing their hair, wearing Western dress, etc, but many continue to dress as they choose.