It is better for the one in ihram to cover his shoulders while in ihram

Question: Is it better for the one in ihram to cover his shoulders or to expose one of them while in ihram?

Answer: The Sunnah for the one in ihram is to place the rida' over both of his shoulders and put its ends on his chest; this is the Sunnah, and it is what the Prophet (peace and blessings be upon him) did. When he intends to perform the arrival tawaf for Hajj or 'Umrah, he should perform idtibaa', placing the middle of his rida' under his right armpit and its ends on his left shoulder, and exposing his right shoulder specifically during the arrival tawaf, meaning the first time he arrives in Makkah for Hajj or 'Umrah. When he finishes the tawaf, he adjusts the rida' and places it on his shoulders and prays the two rak'ahs of the tawaf; based on the saying of the Prophet (peace and blessings be upon him): It is agreed upon that it is authentic.
The Sunnah is to cover his shoulders with the rida' after the arrival tawaf and before the two rak'ahs of the tawaf; based on his (peace and blessings be upon him) action and this hadith. If he places the rida' but does not cover them while he is sitting, eating, or talking with his brothers, there is no harm. However, the Sunnah when wearing the rida' is for it to be on his shoulders and its ends on his chest, except in the case of the arrival tawaf as mentioned above.