Mykale, a naval battle?

[MeinPanzer]

Yes, Saka costume was different, but I amtaking specifically about the Saka Tigrakhauda. They are shown quite clearly at Persepolis as wearing the exact same costume as the Medes, except from the head wear. And yes, this costume was also worn in areas of Anatolia, although trousers were also worn.

In the side-on representations as tribute bearers from Persepolis their costume looks identical, but when they are shown head-on as throne bearers, it's clear that their costume is quite different. They wear caftans and not long-sleeved tunics.

Really? what are you basing this on?

Later 4th and 3rd c. BC representations of Persians, including the Alexander sarcophagus and terracotta figurines, as well as the fact that at this time it became fashionable among the Macedonian upper classes (normally cavalrymen) to wear just such double-belted tunics - exactly when we know it became fashionable to imitate Persian costume. At this time Macedonians were living intimately with Persians, and there is no reason to suppose that they didn't know what they were representing (the Persian costume on the Alexander sarcophagus, for instance, is very accurate, including knee-length tunics, leggings, tiaras, and kandyes).

trousers were often worn by cavalry and was not a later introduction.

Yes, tighter leggings, but not flowing breeches, like those worn by the Shami statue.

So are you saying the Kaftan was introduced by the Parthians? is this not just agreeing with what I have said?

I think I may have misunderstood you. You said "Persian clothing didn't change from the time of the Neo-Assyrian Empire until the Parthians," which I took to mean that Persian costume as seen in Achaemenid times continued to be worn by the Parthians.