I refer to the article Dress matters.
It is a very interesting article that touches on the 'hijab', The dress code for a Muslim woman is not uniform all over the world. It is a mixture of cultural and historical elements with regards to a particular society.
The principle is to cover your physical modesty as enshrined in the Quran. How you wear it does not matter, it is how you respect the principle that matters. The hijab is not a symbol of sexual discrimination or rigidity, it is a sign of obedience and respect for the principle.
It is also the duty of those who respect these principles to convince those who do not.