Since someone thought this was a repost i deleted my other thread to remake the title to be more specific.
https://i.imgur.com/S8Gc6Uk.png
https://i.imgur.com/NLA8TQV.jpg
This is an armored long sleeve tabard and in order to get this effect you need to be in a druid flight form or have a mount where you turn into the mount itself.
Go to the guild master in org, mount, talk to the guild master, demount, change the tabard how you like and GG.
Other people cannot see the visual, only you can. It lasts through load screens and ui reloads, it does not last through log offs.
Dont tell me its a repost I have looked at other threads like this and it is impossible to have a tabard like this without using this specific exploit, because it is not your average guild tabard and no one has posted this.