Hadith.2748 - Imam Jafar ibn Muhammad Al-Sadiq (as) said: "It is appropriate for a person performing tamattu‘ ('Umrah followed by Hajj) when they exit ihram not to wear a shirt and to resemble those who are still in the state of ihram."
Al-Kāfi #1661“Abu ‘Abd Allah (a.s.), has said, ‘It is very proper for one who is for al-Hajj al-Tamattu‘ (advantageous), that after coming out of the...