Answer
Al-Iqtidar: It is to place the garment under the right arm before the Tawaf until its completion, and it is a Sunnah; as narrated by Ibn Abbas (may Allah be pleased with him): "Indeed, the Messenger of Allah (peace be upon him) and his companions performed Umrah from Al-Ji'ranah, and they hurried around the Kaaba, placing their garments under their armpits, having thrown them over their left shoulders." [In Sunan Abu Dawood 2: 177, and Sunan Al-Bayhaqi Al-Kabir 5: 79, and Musnad Ahmad 1: 306, and others, and its narrators are the narrators of the Sahih. See: I'laa Al-Sunan 10: 81]. See: Al-Lubab and Al-Maslak p. 101-102.