I'm all for the "blink me not" integrated functions, but while what I'm about to say may seem anachronistic, I'm against features that allow you to look like you're equipping an item different from the one you're equipping.
I know such a feature became quite liked in other games (WoW, soon FFXIV too) but personally I don't like it.
I recognize its value and its pros, but they do not counterbalance their cons, imho.

Especially in an "old" game like FFXI, child of another era, how your character looks is part of your "social status", of who you represent, of the hardship to obtain that specific item you're showing off.
Destroying this "social mechanism" would mean that yet another thing of what FFXI used to be and represent would be lost forever because of fanservice.
I know I'll probably be a lonely voice, but I'm against such a feature if it's not LOCAL on your machine, but for everybody.
If it's something just local (like some Windower addons) then it's no problem. It would change how YOU see your character, not how OTHER PEOPLE see you, I have no problem at all with this.