Double breasted or center fastening?

[immortal]

Please do post the citations for such articles, because I'd be very eager to read them.

Next time I speak to Dr. Miller Collett I will be sure to get the name of the author and pass it on to you asap.

Firstly, how many depictions or artefacts of Alexandrian Macedonian date to we possess? We can't expect to be able to corroborate every minute detail with an exactly contemporary example. Secondly, the Alketos monument dates to c. 320, and so is just slightly later than Alexandrian.

There are a huge amount that are unpublished in various places in Greece and Macedon. Several iron cuirass of the Vergina style have been found for example.

Just a short list (and I'm sure Paul MS can pitch in here, because he's more familiar with the mosaic than I am), and I can't comment too thoroughly on the Persian details:

A late 4th - early 3rd c. BC marble statue of a Macedonian officer from Amphipolis shows shoulder pteryges in use with a cuirass like Alexander's.

I must admit I am not familiar with this, could you post a link to an image of it please?

The decorations on Alexander's bridle is almost identical to actual decorations found in late 4th-early 3rd c. BC rich Thracian burials.

Please correct me if I am wrong, but was this style not in use over a very wide area and over a long period of time?

Alexander's cuirass has a small section around his waist reinforced with scale, which I don't think I've ever seen on Roman art, and is almost entirely absent from Hellenistic examples (I know of one depiction of a cuirass from Pergamon reinforced with scales, but there they are vertical strips on either side of the torso), but which is common in Classical examples.

The guilloche pattern shown around the rim of the fallen Argive shield is a characteristic of Classical examples, but is absent from Hellenistic and later representations.

The Chalcidian helmet shown fallen on the ground disappeared after the 4th c. BC.

The Boeotian helmet shown on a rider behind Alexander crowned with a wreath is not found after the 3rd c. BC, but is identical to others found on late 4th c. BC representations.

I would think that classical Greek/Macedonian styles would be well known. If we know of these representations, surely it is possible that those civilizations who existed closer to the time of their creation were also aware of them?

The Persian shabraques are of a particular "stepped" style which disappears after the 3rd c. BC.

The Persian chariot matches the Oxus model quite closely.

Where does this saddle cloth disappear from? Persian art.. could this be because pretty much zero Persian depictions from the 4th century until the Sassanid period exist that we know of?

The Oxus model is not definitely identified as a Persian Chariot.

Many of these details were not picked up by Classicizing artists, so I have no idea how an Italian artist of c. 100 BC would have been able to depict them together without some serious research.

Im not saying the mosaic is completely made up! Im just saying it should not be used as a primary source for the appearance of either the Macedonian army or Persian army.
It could be a copy of a copy of a copy, each getting some details right and others replacing them with details that were contemporary to the copies creation.