bq. For support for gender equality in the public sphere, both male and female respondents reported less progressive attitudes to female interviewers wearing hijab than to other interviewer groups. For support for international standards of gender equality in family law, male respondents reported more liberal views to female interviewers who do not wear hijab, while female respondents reported more liberal views to female respondents, irrespective of dress.
That is from a new paper by political scientist Lindsay Benstead. It is based on an extensive field experiment in Morocco. Find it here (ungated).