Sunan an-Nasa'i, Book 48, Hadith 257 (In-Book) ⓘ
It was narrated that Anas said: "I saw Zainab, the daughter of the Prophet [SAW], wearing a Qamis of Sira'."
أَخْبَرَنَا الْحُسَيْنُ بْنُ حُرَيْثٍ، قَالَ حَدَّثَنَا عِيسَى بْنُ يُونُسَ، عَنْ مَعْمَرٍ، عَنِ الزُّهْرِيِّ، عَنْ أَنَسٍ، قَالَ رَأَيْتُ عَلَى زَيْنَبَ بِنْتِ النَّبِيِّ صلى الله عليه وسلم قَمِيصَ حَرِيرٍ سِيَرَاءَ .
also referenced under: Hadith 5296 (Reference) & Volume 6, Book 48, Hadith 5298 (DarusSalam)