Analysis of information sources in references of the Wikipedia article "Cotton Merchants' Gate" in English language version.
the street of the Gate of the Cotton Merchants' Market Bāb Sūq al-Qaṭṭānīn
Bab al-Qattanin is the grandest of the Haram gates
In short, all the indications are that Bāb al-Qaṭṭānīn is an original Mamluk construction, 'recently constructed and newly opened' in al-ʿUmarī's words, to link the new market-street with the Haram.
Bab Suq al-Qattanin Gate: view from inside the Haram