وَالقَواعِدُ مِنَ النِّساءِ اللّاتي لا يَرجونَ نِكاحًا فَلَيسَ عَلَيهِنَّ جُناحٌ أَن يَضَعنَ ثِيابَهُنَّ غَيرَ مُتَبَرِّجاتٍ بِزينَةٍ ۖ وَأَن يَستَعفِفنَ خَيرٌ لَهُنَّ ۗ وَاللَّهُ سَميعٌ عَليمٌ

Elderly women who are past the prospect of marriage can relax their dress code, provided they don’t flaunt their beauty. However, it’s better for them to maintain modesty. God is All-Hearing, All-Knowing.