It is narrated from Sayyiduna Abdullah bin Zaid, who was among the participants of Uhud, that once the Prophet (ﷺ) went out to pray for rain (Salat al-Istisqa). I saw that on this occasion, he made a long supplication and asked abundantly. Then he turned towards the Qiblah and turned his cloak inside out, changing the outer part with the inner part. The people also did the same.
Hadith Referenceمسند احمد / مسند المدنيين رضي الله عنهم اجمعين / 16465
Hadith Gradingحکم دارالسلام:حديث صحيح، خ: 1005، م: 894 دون قوله: «وتحول الناس معه» ، فهو حسن