Rebel: Even when you try to find legitimate websites explaining the meaning, all you get is "modesty".
It does strike me as a symbol of subservience and silence. It would be interesting to confirm this information from a legit source.
The original meaning of the burqua wasn't "modesty" per se. I apologize that I don't have references for what I am about to say - it has been far too long ago that I researched this and I no longer have the textual references to offer you...but, if you don't mind me just "spouting" off...
In primitive times, women were feared by men because of their perceived connection to the divine that men lacked. Women were seen as having a special connection to god because of their ability to "make life" - they could have babies and men couldn't which led to women being seen as more spiritually powerful than men.
The other thing was that "hair" and/or "head" was seen as the way that people could communicate with "god/divine". Therefore, when men wanted to communicate with god, they superstitiously believed that if a woman was present, with her head uncovered, that she would be able to over-ride their attempts to connect with the divine. So, the men, in order to assert their own power, required that women cover their head so that they wouldn't interfere with that divine communication. And women complied - out of respect for the men - the act acknowledged that women had more spiritual power than men did.
It has been time and men's personal fears that have led to how culture views the head covering (or burqa) today - the sexual connotations have only evolved through the patriarchal fear of male sexuality, not female sexuality. Men are acting out their fear of the sexual power of women whereas the original meaning has to do with spiritual power.
In today's Aboriginal cultures, the ones who follow the traditional way, this concept can be seen in the observance of traditional ceremonies. A women who is on her "moon time" is required to step back and not engage in the ritual of smudging and other ritualistic behaviors. This is not seen as a subservient act that puts down women, but rather an act that acknowledges the power of women. The Aboriginals do this as an act of respect for women - that women are the most like the Creator when they are menstruating, not that they are "less than" men, but rather, "more than" men.
Today's association of sexuality - that women are sex objects and must cover themselves up - is a view that has culturally evolved from men's desires and fears. It no longer holds the original purpose of acknowledging the divine connection that women have, that men lack.