First of all, I am not 100% sure a thread like this already exists, at least couldn't find any quick enough.
If this isn't the right place to post this please correct me, I thought tabards could be placed under transmogrification.
Okay, here it goes. I would really like to see personal customization for tabards! At the moment this is tied to the guild you joined, and to be honest, I don't like walking around with a pink monkey combined with green fluffy borders adorning the gear of horde/alliance commander 'cause the guildmaster chooses so.
Since you're a commander in Draenor with your own forces, it'd make perfect sense to have your own banner and with that, also a tabard. It'd give transmogrification more depth and it'd open more options for garisson personalisation.
Just wanted to share the idea and maybe have some feedback from you guys!
Cheers!