That's only more plausible if you're entirely unfamiliar with Christian clerical and liturgical garments. Traditional Christian religious garments are rooted to

That's only more plausible if you're entirely unfamiliar with Christian clerical and liturgical garments. Traditional Christian religious garments are rooted to a large extent in the Mediterranean, especially Greece, the Levant, and North Africa, but none of those places would be centers of Arabic culture until centuries later. To the extent they're influenced by Arabic culture, the link probably goes both ways. There's a shared history, after all; shared at a time when what would become modern European and Arabic cultures were minority cultures at the periphery of far more ancient empires.