The tl;dr of this image is:
>399aa
is a Moor/Maghrebi. Not all would have mail beneath the burnouse or whatever the term is
>399z
Is a mixture of Franks, Andalusians, Berbers-Arabs, and one black guy. The Turbaned are moors/Maghrebi, the hatless probably is too, the helmets may be andalusians.
>399ab
Great helmet is clearly a Christian, other are Andalusians and moors

Quilted armor was present in the Sudan since at least the 1st/2nd century BC or thereabouts. The Periplus of the Erythraean Sea references Ptolemy sending on an expedition against the Ethiopians 100 horsemen whose rider and horse were dressed in felt or quilted garments that left nothinjg but the eyes covered. Someone (I couldn't remember the name of the book, Erithyean whatever) posting the quote on a forum posits they think the invetors were Ptolemaic. Except the author says they are called 'kasas' in those parts - and if they were Greek they'd call it something greek.

I hate to sound like a woke faggot but I think there's a tendency to think of blacks as nothing but ooga booga bone-in-nose half naked gorillas at all time. Given the Kushite dynasty was noted for its cavalry and Kushite horse-handlers show up in the Assyrian records and they are inheritors of the Egyptian tradition, barding (and felt armor for the rider) is completely reasonable. Especially given how much the Nubians between Aethiopia and Egypt were bow-happy.

That's not medieval, but it points to a continuity with the later medieval quilted barding cavalry of the North-east Africa.