A Belgian law banning the wearing of burka-style Islamic dress in public goes into effect on Saturday, but a lawyer hopes to get the law suspended next week pending a hearing.
Belgian MPs approved the ban on grounds of security.
But Ines Wouters, a lawyer representing two women who sometimes wear the burqa, said today she had taken the case to the country's constitutional court, and would request a suspension.
ms Wouters said the law conflicted with freedom of religion, the right to privacy, freedom of expression and equality between men and women.
She said police officers can ask people for their identification.
But, she said: "Security in Europe does not mean you can be identified and controlled by anybody at any time."