While head and capes can be hidden bu choice, and in 5.3 they introduced invisible shoes for transmog purpose, I'd like to wonder what other transmog options do people want to see, if blizzard decided to.
Even if the option to go fully without armor for the fun of it, I'd always at least hope it be an option for us to make certain characters hide aspects of armor that don't look right, like those who suffer from clipping issues for example.