Well that's my idea I'm not sure if it was mentioned here but I haven't found it.
At this time players in WoW are able to turn off visibility of helm and cloak. It would be nice to add options to make the same with chest armor - I play a worgen hunter and when not in dungeon group I don't wear any chest armor because I think he looks alot better and more respectfull bare-chested than in a pink heirloom armor. I know transmogrification will solve the looks issue but still I think we players should be able to turn off visibility of chest armor just to allow us to show off some muscle without loosing the chest stats. This would also make pvp combats more challenging as you won't see what your opponent is wearing if he/she turns off visibility.