The Equality Commission of the Netherlands decided in November that the ICA shouldn't have insisted that Samira Haddad, 32, wears a headscarf to be accepted as a teacher.
The ICA was given a month to reply to the commission's ruling. The school's board agreed that a Hijab was not necessary for the performance of duties in the school, but said that there are clear clothing regulations in the Islamic religion.
"The necessity is linked to our philosophy of life and the related rules." The school also rejected concerns about intolerance. It said that the key issue was not one of tolerance but the freedom of religion.
"The profession of the Islamic faith leads to prescribed regulations in relation to clothing," the ICA said. The decision by the Equality Commission is not legally binding.