The University of Michigan (Institute for Social Research) ran a poll in Egypt, Iraq, Lebanon, Pakistan, Saudi Arabia, Tunisia and Turkey to find out what most people felt was an appropriate way for women to dress in those Muslim-majority countries.
The infographic below shows the six different styles of dress people were to choose from. The white hijab was the most popular choice for most.
Not really surprising which countries prefer which.
More details at Pew Research Center.