About Yazidis, more recent info & very interesting. Sending it from my mobile so hope the link works. Some references & terms need to be clarified if you aren’t fully familiar with some aryan pagan & seemingly zoroastrian concepts mentioned there —http://www.bbc.co.uk/news/blogs-magazine-monitor-28686607
In formal costume the men wear thobes and ghutras, just like the Saudis.