Of course, if you ask someone to remove a piece of clothing for a good reason, you must provide the proper environment to ensure privacy is maintained.
I have lived in Muslim countries for 12 years out of my 63 years on earth. Recently, I have seen an increase in the number of Muslim women who wear head scarfs primarily for fashion. If you Google "clothing for Muslim women" you will see many sites that sell very expensive and very stylish clothes. Of course, to the eye of a Western man, the clothes may not seem attractive.. but of course beauty is in the eye of the beholder.
I use this nun for example. She is obviously an attractive woman and her head scarf does not hide this. In this photo she is wearing more homespun material - so she appears pretty hardened. Again, this is the image she wishes to project.
My point is that all American's must be careful not to associate the clothing style of Muslim women with the same mindset of a hardened fanatical Taliban fighter. If the only time you see a women wearing a head scarf is on a news program showing a war zone, it would be easy to make the wrong associations.