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It was narrated that Umm ‘Atiyyah said: “The Messenger of Allah (ﷺ) commanded us to bring them (the women) out on the day of Fitr and the day of Nahr.” Umm ‘Atiyyah said: “We said: ‘What if one of them does not have an outer covering?’ He said: ‘Let her sister share her own outer covering with her.’”
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا أَبُو أُسَامَةَ، عَنْ هِشَامِ بْنِ حَسَّانٍ، عَنْ حَفْصَةَ بِنْتِ سِيرِينَ، عَنْ أُمِّ عَطِيَّةَ، قَالَتْ أَمَرَنَا رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ أَنْ نُخْرِجَهُنَّ فِي يَوْمِ الْفِطْرِ وَالنَّحْرِ . قَالَ قَالَتْ أُمُّ عَطِيَّةَ فَقُلْنَا أَرَأَيْتَ إِحْدَاهُنَّ لاَ يَكُونُ لَهَا جِلْبَابٌ قَالَ " فَلْتُلْبِسْهَا أُخْتُهَا مِنْ جِلْبَابِهَا " .
sunnah.com