Nasai

(1) From the chapter heading of Imam al-Nasa’i rahimahullah, it is understood that he considers the mentioned coat of mail (zirah) to be separate from the dowry (mahr), and regards it as a special gift for the occasion of the bride’s departure (rukhsati) and seclusion (khalwah). Whereas, according to many scholars, this is in fact the dowry (mahr) itself, which was given at the time of departure (rukhsati) instead of at the time of the marriage contract (nikah). And Allah knows best.

(2) “Hutamiyyah coat of mail”: Some scholars have said that “Hutamiyyah” is a description of the coat of mail, meaning “that which breaks,” and by this is meant that which breaks swords, spears, and arrows. It has also been said that an open and heavy coat of mail is called “Hutamiyyah.” And it is also said that “Hutamiyyah” is attributed to Hutam ibn Muharib, a branch of the tribe of ‘Abd al-Qays, whose people used to make these coats of mail. And this last opinion is the most reliable. And Allah knows best. See: (al-Nihayah fi Gharib al-Hadith: 1/402)

Takhrij:
«أخرجه أبوداود، باب في الرجل يدخل بامرأته قبل أن ينقدها شيئًا، حديث:2125، والنسائي، النكاح، حديث:3377، والحاكم: لم أجده، وابن حبان (الإحسان):9 /50.»©Explanation:
➊ From this hadith, in addition to the issue of mahr (dower), it is also understood that the Prophet sallallahu alayhi wa sallam did not possess the knowledge of what has happened and what will happen (ilm ma kana wa ma yakun); this is why he asked Ali radi Allahu anhu, “Where is your Hatami coat of mail?” Otherwise, he would have said, “Bring me your Hatami coat of mail which you have placed at such-and-such location.”
➋ It is also understood that the father-in-law can demand the right of mahr (dower); however, only that which the son-in-law possesses should be requested from him. Such a thing should not be demanded or requested which is beyond his means.