From my piece over at Women’s Review of Books:
The legal policing women’s headscarves is rooted in a mélange of sexism, xenophobia, religious bias, and racism. Unlike the niqab (veil), hijab as sartorially expressed by the headscarf does not obscure the face. While the niqab can raise concerns about identification and anonymity, which may be rational in some situations, such as a trial in which the identity of a person is a central issue, the headscarf evokes anxieties of a less logical sort.
Read more here.