Bukhari

Hadith Commentary:
In this hadith, examples of the miser and the charitable person are given.
The coat of mail (armor) of the generous person becomes so loose that it is like a very loose garment; when a person walks, it drags on the ground and erases the footprints.
The meaning is that the heart of a generous person becomes happy and expansive by spending money.
The coat of mail of the miser, on the very first attempt, clings tightly to his chest, and he is not granted the ability to be charitable at all.
His hands become confined within the coat of mail.
The narration of Hasan ibn Muslim has been recorded by Imam Bukhari in the Book of Clothing, and the narration of Hanzalah has been connected by Isma'il, but the narration of Layth ibn Sa'd with this chain has not been found.
However, Ibn Hibban has extracted it from Layth through another chain.
As Hafiz Ibn Hajar rahimahullah has stated.

Hadith Commentary:
(1)
The example mentioned in the hadith is intended to illustrate the superiority of the charitable person over the miser.
(2)
The noble hadith scholars have explained this in various ways.
Ibn Battal said that when the generous person practices generosity, his charity becomes an expiation for his sins and wipes out all his sins, just as when a shirt is spread out, it covers the entire body of the wearer and protects him. In contrast, the miser’s soul does not comply with spending, so he is deprived of the expiation of sins.
Some scholars have explained it in this way: when the generous person intends to spend, his chest expands and his hands also cooperate with him, whereas the miser’s chest becomes constricted at the time of generosity, and his hands do not assist him in spending.
(3)
This example can also be explained as follows: Allah, the Exalted, covers the generous person, just as a shirt covers a person. In this way, Allah, the Exalted, veils the generous person in this world and the Hereafter, whereas the miser’s shirt remains stuck around his neck, leaving his body exposed, which becomes a cause of his humiliation and disgrace. In this way, Allah, the Exalted, humiliates and disgraces the miser in both worlds.
(4)
The corroboration of Hasan ibn Muslim has been narrated by Imam Bukhari rahimahullah himself with a connected chain.
(Sahih al-Bukhari, Kitab al-Libas, Hadith: 5797)
Whereas the other narration of Abu Hurairah radi Allahu anhu has been mentioned in Sahih Ibn Hibban.
(Fath al-Bari: 3/387)