A New Realm with new Threads (Gear Styles that should be around in ARR)

[Zantetsuken]

10, and 12 are at about the same place technologically, if not, 12 would be ahead.
Even so, I can imagine some of the cities in 12 being similar to what we'll see in some Garlean cities.

Even the most advanced tech of the Archadian empire didn't compare to Zanarkand or This

The average resident of Spira or Coccoon had lives of leisure, with access to television (or equivalent), music concerts, sports, etc. Their fashions were in-line with a world of media, pop-culture, and convenience.

In contrast, nearly all technology in FFXII was war-focused. As such, it wasn't readily available to the general populace and had little impact on Ivalician fashion - much of which was pre-industrial in design. (like FFXIV has now)

From what I've seen, the Garlean empire is much closer to Archadia in both technology and culture than it is to anything from FFX or FFXIII.

Also, the devs revealed that FFVI played a big role in the inspiration of XIV - the fashions and designs from that game were derived from steampunk, Victorian, and classic Japanese influences. Perhaps the Garlean empire may fall into that look as well..who knows?

So as I said, I don't think the fashions from 7, 8 ,10, or 13 would fit well in Eorzea currently - its just not the right world for them.