Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) said concerning the saying of Allah Almighty: "And the elderly women who have no hope of marriage" [Surah al-Nur: 60]: This refers to the woman on whom there is no blame if she sits in her house in a gown and head-covering and takes off her outer cloak, as long as she does not display her adornment in a way that Allah dislikes. That is the saying of Allah Almighty: "There is no blame on them if they put aside their outer garments, not displaying adornment" [Surah al-Nur: 60]. Then He said: "But to refrain is better for them" [Surah al-Nur: 60].
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13531