Is it a Sunnah for the Ma'mum in Salat-ul-Istisqa' to make Du`a' standing or sitting after the Khutbah?

Q 3: Is it a Sunnah (action following the teachings of the Prophet) for the Ma'mum (person being led by an Imam in Prayer) in Salat-ul-Istisqa' (prayer for rain) to make Du'a' (supplication) standing or sitting after the Khutbah (sermon)? Is it permissible to turn one's garment on the opposite side?

A 3: It is Mustahab (desirable) for the Ma'mum to turn his Rida' (garment worn around the upper part of the body) while standing and offer Du'a' while facing the Qiblah (Ka`bah-direction faced in Prayer) and standing as the Imam (the one who leads congregational Prayer) does.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.