Abdullah bin Zaid Al-Mazni (may Allah be pleased with him) narrates that the Messenger of Allah (ﷺ) went towards the Eid ground for the prayer of Istisqa. When he faced the Qiblah, he turned his cloak inside out.
Hadith Referenceمسند الإمام الشافعي / كتاب العيدين والأضاحي والاستسقاء / 514
Hadith Takhrijاخرجه مسلم، الاستسقاء، باب صلاة الاستسقاء (894)۔