Nasai

(1) From this blessed hadith, it is understood that while men are permitted to use silk garments under certain necessities, it is also evident that without necessity, a border or strip of silk equivalent to two or four fingers’ width may be attached.
(2) This blessed hadith is an evidence for those who hold the view that it is permissible to have silk strips and edges on garments.
(3) From this blessed hadith, it can also be deduced that the amount of silk mentioned in the ahadith (two or four fingers’ width) may be used in one place or in separate places. The only condition is that the amount of silk used should not exceed what is stated in the ahadith.
(4) “He may wear this much” refers to the borders of cloaks and shirts being closed off with a strip, for example: the hem, collar, and sleeves, etc. There is no harm in this. Sometimes, silk strips are also placed on the shoulders. There is no harm in these either, provided they are not too wide.
(5) “So I became certain”—it appears that the taylasan was a type of cloak that was placed over the shoulders, with a silk strip attached to its edges. The one who said this sentence is Sulayman al-Taymi, the student of Abu Uthman al-Nahdi.

Hadith Commentary:
(1)
Silk is forbidden for men to wear.
The reason for this is pride and boasting, imitation of polytheists and women, and extravagance.
There is consensus among the scholars on this matter.
Only embroidery or designs up to the width of two fingers are permitted.
According to some narrations, up to four fingers’ width of silk is permissible, provided that the fingers are joined together and not spread apart, as in one narration it is mentioned that Umar radi Allahu anhu used to prohibit both fine and coarse silk except for an amount like this—then he pointed with one finger, then the second, then the third, then the fourth, and said that the Messenger of Allah sallallahu alayhi wa sallam used to forbid us from more than this.
(Sunan Ibn Majah, Al-Libas, Hadith: 3593)
Similarly, Asma bint Abi Bakr radi Allahu anha said to her slave girl:
“Bring me the cloak of the Messenger of Allah sallallahu alayhi wa sallam,” so she brought a cloak made of thick wool, whose hem, both cuffs, and both side slits were made with thick silk thread.
(Sunan Abi Dawud, Al-Libas, Hadith: 4054)
In any case, silk is forbidden for men, but up to four fingers’ width of silk is permissible, whether it is in the form of embroidery or as a piece of silk fabric.
If it is less than this amount, it is better; more than this is not permissible in any case.
And Allah knows best.

Hadith Footnote:
Vocabulary of the Hadith:
‘Atam:
To delay or to make late.

Hadith Commentary:
Vocabulary of the Hadith:
Azrar:
Plural of zir,
button,
fastener,
the intended meaning is the edges and sides.

Explanation:
1:
Silk clothing is, according to Islamic law, prohibited (haram) for men.
However, if silk is attached to a garment in an amount equal to two, three, or four fingers' width,
or if there is an excuse, such as itching or the like, then there is allowance for it.

Benefits and Issues:
For men, only this much of silk is permissible, but for women it is completely lawful.

Benefits and Issues:
(1)
If a small amount of silk is attached to the edges of a garment, such as the slit of the hem or the collar in the form of a border, then wearing such clothing is permissible.

(2)
The permissible amount of silk can be up to the width of four fingers at most; however, it is better if it is less than that.

Benefits and Issues:
➊ It is forbidden (haram) for a man to wear clothing made of silk, but if there is a small amount of silk on the edges, it is permissible.

➋ The permissible limit for silk is up to the width of four fingers at most. If it is less than this, it is better; more than this is not permissible.

Takhrij:
«أخرجه البخاري،اللباس، باب لبس الحرير للرجال وقدر ما يجوزمنه، حديث:5828، ومسلم، اللباس، باب تحريم استعمال إناء الذهب والفضة، حديث:2069.»©Explanation:
It is legally prohibited (haram) for men to wear silk; however, in the case of an excuse such as itching, temporary permission is granted.
Apart from this, if there is silk attached to a garment equivalent to two or four fingers in width, then there is allowance for that as well.