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What I can see is that the way these people dress is an adaptation of Roman and Persian clothing for the desert climate. They continue to wear more modern, loose-fitting clothes.  The sirwal is a garment said to have originated in Central Asia. It is a loose-fitting pair of trousers. https://en.wikipedia.org/wiki/Persian_clothing It appears to be a combination of different fashions and cultural centers. The Parthians seem to play an important role, not just the Persians. The inventors of the trousers: The Iranian-speaking peoples - such as the Scythians, Medes and Achaemenid Persians — are historically recognized for introducing trousers to the ancient world. Practical Necessity: While the Greeks, Romans or Egyptians wore robes and togas, these peoples needed a forked garment to ride a horse comfortably and protect themselves from the weather. https://en.wikipedia.org/wiki/Sirwal The word is of Persian origin; shalwār (شلوار) was borrowed into Greek as σαράβαρα sarábāra, "loose trousers worn by Scythians". The words used in Balkan languages came through the Ottoman Turks and did not continue the Ancient Greek designation. From the 7th to the 3rd century BC, the Scythian people of the Pontic Steppes produced and adopted a wide arrangement of clothing. The clothing of the Scythians was formulated in response to the nomadic, highly mobile lifestyle of the early Scythian era and the sedentary lifestyle of later Scythian kingdoms. Much of what is known about Scythian attire comes from the remains of clothing found in Scythian burial sites.

Men's clothing is difficult because there are pants. All I can find is clothing similar to Odenathus It seems to be Looser than Roman clothing and simpler than Persian clothing. The photo shows 3 gentlemen wearing baggy pants.  

Some fashions are Ottoman according to museums in Egypt and Jordan. These are some details that come from Central Asia or the Arabian Peninsula, even India.   I'm going to upload what I found in museums (via Pinterest). There are many images, the one I circled in red is from an Egyptian museum but from the Ottoman period. Although the style of the clothing is very similar to that of the characters from Aladdin. Many of these styles seem to be from Central Asia and the steppes. Even so, it is not impossible due to cultural contact.

I had a problem with the forum; some of what I wrote disappeared. Fortunately, I saved the images and I still have the text in my mobile device's memory.   Egyptian    It is a long white shirt with sleeves and with two buttons shorter in length and sleeves, it was worn on occasions before the reign of Khedive Ismail, and it was worn with a wide belt and a pendant with an energetic headdress.   I originally thought that these cultures have many similarities due to their geographical and cultural proximity. Hebrews, Phoenicians, Syrians, Egyptians. They share many clothes or outfits.

I found 2 images made with AI but well done. Below I'll leave some pictures of Hollywood.  One is an Arab woman and the other a Bactrian princess. This is a character from the series The Chosen who has good advice regarding clothing. As always, Hollywood has its problems with armor; sometimes, for safety reasons, they don't use realistic armor. It seems that Middle Eastern and Central Asian cultures liked those hanging ornaments.