The Khimar (headscarf) and Jilbab( womens outer garment) are obligatory as is the covering of the women feet in public because the Prophet explained the verses in the Quran by always pointing to his hand and face to indicate that these two parts of the body are obligated to be covered. He also explained that the the Jilbab must be loose so the shape of the body is not revealed and also the material should not be see through. The Quran explained that the Khimar(headscarf) must cover the bossom.

So it is clear from the Quran and Sunnah that women must cover all of her hair to the bossom and all of her body except her hands and face.

Some scholars did interpret verses in the Quran that were specific to the prophet's wives to mean all believing women but this was an error on their part becuase the verses were restricted to the wives of the prophet. Some scholars also reacted to the situation in society in terms of the decline in standards in the 18th and 18th centuries whcih led them to call for the Niqab in a reactionary fashion without due care about what the Sharia stipulated...

As for the ban of waring the niqab in some European countries then it is a reactionary measure and a weakness of these societies and their anti Islam bias..they are in fact attacking the Sharia but using the Niqab as the focal point of this attack..they in fact hiding behind their cowardice of attacking muslim women....

It is a ridiculous assertion to link the wearing of piece of cloth to national security or crime. These are just hollow claims which the western politicians hide behind...they are more worried about the number of european women embracing Islam and adopting the hijab. Thus they will continue to make it harder to be a muslim in europe even if you are european.