Unfortunately, we are living in time of immodesty, in which unveiling your awrah is seen as a sign of virtue and covering it as a sign of backwardness and oppression.
I picked up this concise book from my local bookshop in which the author addresses the importance of Hijab and the virtues of implementing the rulings of Hijab on a society and the ruinous effect of discarding it.
And provides compelling answers to various excuses which are used by sisters for not covering up.