Hijab Is Modesty

Allah (SWT) made the adherence to the Hijab a manifestation for chastity and modesty:

يَا أَيُّهَا النَّبِيُّ قُلْ لِأَزْوَاجِكَ وَبَنَاتِكَ وَنِسَاءِ الْمُؤْمِنِينَ يُدْنِينَ عَلَيْهِنَّ مِنْ جَلَابِيبِهِنَّ ذَلِكَ أَدْنَى أَنْ يُعْرَفْنَ فَلَا يُؤْذَيْنَ

"O Prophet! Tell your wives and your daughters and the women of the believers to draw their cloaks (veils) over their bodies (when outdoors). That is most convenient that they should be known and not molested." (Qur'an 33: 59)

In the above Ayah there is an evidence that the recognition of the apparent beauty of the woman is harmful to her. When the cause of attraction ends, the restriction is removed. This is illustrated in the case of elderly women who may have lost every aspect of attraction. Allah (SW) made it permissible for them to lay aside their outer garments and expose their faces and hands reminding, however, that it is still better for them to keep their modesty:

‏وَالْقَوَاعِدُ مِنَ النِّسَاءِ اللَّاتِي لَا يَرْجُونَ نِكَاحًا فَلَيْسَ عَلَيْهِنَّ جُنَاحٌ أَنْ يَضَعْنَ ثِيَابَهُنَّ غَيْرَ مُتَبَرِّجَاتٍ بِزِينَةٍ وَأَنْ يَسْتَعْفِفْنَ خَيْرٌ لَهُنَّ وَاللَّهُ سَمِيعٌ عَلِيمٌ‏

"And as for women past child-bearing who do not expect wed-lock, it is no sin for them if they discard their (outer) in such a way as not to show their adornment; but it is best to be modest and Allah knows and sees all things provided they do not make a display of their beauty; but it is best to be modest and Allah knows and sees all things." (Qur'an 24:60)

So how about young women? Clearly they must stay modest find not display their beauty.