Narrated Umm Salamah, Ummul Muminin: The clothing which the Messenger of Allah ﷺ liked best was shirt.
Related hadith on this topic
Explanation & Benefits
Maulana Ataullah Sajid
Benefits and Issues:
Perhaps the reason for this is that a sheet (chadar) has to be managed, whereas after wearing a shirt (qamees), the hands can be used more easily.
And the shirt (qamees) of the Arabs reaches down to the bottom, so if it is made of thick cloth, then even without an izar (lower garment), the private parts remain covered.
And Allah knows best.
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 3575