From Sahih Bukhari (Hadith 1027):
Narrated `Abbad bin Tamim from his uncle who said:"The Prophet (ﷺ) went out to the Musalla to offer the Istisqa' prayer, faced the Qibla and offered a two rak`at prayer and turned his cloak inside out." Narrated Abu Bakr, "The Prophet (ﷺ) put the right side of his cloak on his left side
Reference: Bukhari 1027