question #3 Sahih al-Bukhari 1024, Book 15, Hadith 19 : Why might the Prophet (ﷺ) have turned his cloak inside out during the prayer for rain?

from his uncle who said, “The Prophet (ﷺ) went out to invoke Allah for rain. He faced the Qibla invoking
Allah. He turned over his cloak (inside out) and then offered two rak`at and recited the Qur’an aloud in
them.”