Rabat rally against king's decision planned for Friday.
A Security Council diplomat said that the resolution contained more rights language than previous years, describing it as a "step forward."
Women's rights activists across the Middle East fear the bare breasts may hurt their cause more than help it.
The cradle of the Arab Spring is increasingly looking like the birthplace of jihadists.
Action comes nearly a year after 16-year-old's rape victim's suicide.