The Prophet ﷺ went out towards the Musalla in order to offer the Istisqa' prayer and when he intended to invoke (Allah) or started invoking, he faced the Qibla and turned his cloak inside out.
أَخْبَرَهُ أَنَّ النَّبِيَّ ﷺ خَرَجَ إِلَى الْمُصَلَّى يُصَلِّي وَأَنَّهُ لَمَّا دَعَا أَوْ أَرَادَ أَنْ يَدْعُوَ اسْتَقْبَلَ الْقِبْلَةَ وَحَوَّلَ رِدَاءَهُ قَالَ أَبُو عَبْدِ اللَّهِ ابْنُ زَيْدٍ هَذَا مَازِنِيٌّ وَالأَوَّلُ كُوفِيٌّ هُوَ ابْنُ يَزِيدَ
'Abdullah b. Zaid al-Ansari reported that the Messenger of Allah ﷺ went out to the place of prayer in order to offer prayer for rainfall. And when he intended to make supplication he faced Qibla and turned round his mantle.
أَخْبَرَهُ أَنَّ رَسُولَ اللَّهِ ﷺ خَرَجَ إِلَى الْمُصَلَّى يَسْتَسْقِي وَأَنَّهُ لَمَّا أَرَادَ أَنْ يَدْعُوَ اسْتَقْبَلَ الْقِبْلَةَ وَحَوَّلَ رِدَاءَهُ
The Messenger of Allah (pbuh)went out to the place of prayer to pray for rain. When he wanted to make supplication, he faced the qiblah and turned around his cloak.
أَخْبَرَهُ أَنَّ رَسُولَ اللَّهِ ﷺ خَرَجَ إِلَى الْمُصَلَّى يَسْتَسْقِي وَأَنَّهُ لَمَّا أَرَادَ أَنْ يَدْعُوَ اسْتَقْبَلَ الْقِبْلَةَ ثُمَّ حَوَّلَ رِدَاءَهُ