Mykale, a naval battle?

[MeinPanzer]

Yes, this is what I am trying to say. The Saka Tigrakhauda seem to look very different to the rest of the depictions of the Saka. They are also grouped with the contingents from Anatolia and Iran on the Apadana. Are there many surviving Saka depictions of themselves?

I see. I've never realized this before, but it makes sense, especially considering the difficulties many kings had with the recalcitrant Saka populations living on the more distant marches of the empire. As for the Saka depictions of themselves, yes, there are a number. One important one is the embroidered tapestry from Pazyryk showing a cavalryman and a woman, but there's also many metal representations, including figured belt buckles and models in the round, like those mounted on braziers associated with Zoroastrianism which have been found in the region of Kazakhstan.

I think these are potentually very important. They are almost identical to the tunics worn by the 'Persians' on the Alexander sarcophagus. In my opinion it only backs up my theory that the majority of Greek depictions of Persians show a mix of many different styles, many of which are not Persian at all.

I think they would be reluctant to depict Persian dress in the Parthenon, seeing as it was built on the ruins of the site the Persians destroyed. If it was Persian in origin, I think they would know about it. Even if it was eastern, why would they depict an Athenian wearing anything but Greek clothing on a monument that was promoting the pinnacle of Greek (or Athenian) civilization? We know from Xenophon’s comments on the Ionians that they were not particularly fond of them. Also, are these horsemen not supposed to depict the casualties at Marathon (or is this a myth?).
I think the fact that this is only shown in Greek art speaks volumes.

You seem to be approaching this from too modern a perspective. You have to remember that though the Persians were viewed as the great enemy during the Persian wars, in the years that followed they were intimately involved in Greek politics and, as the major power in the eastern Mediterranean, had an enormous cultural influence on that portion of the world, including Greece. You state that the Greeks would not have shown Persian dress on a site the Persians destroyed, but you are forgetting that one of the most important buildings erected in the middle of the 5th c. BC besides the Acropolis, the Odeon of Pericles, is widely regarded to have been based on Persian architecture, either drawing from the design of the tent of the King of Kings or the apadana.

The Greeks did not view ethnicity and national identity the same way we do. Nor would they have viewed the Parthenon as some sort of monument which had to promote a particular view of the Athenian citizenry. Giannis said it better than I can - if Persian-style tunics were stylish, then the artist probably simply reflected everyday life in the monument.