There really should not be any class restrictions on glamour in this game. I mean, our current situation is this:

Bikini Tank = Okay!
Healer in cloth shirt = Bad!

Tank in Caster Robes = Okay!
Caster in Tank Gauntlets = Bad!

How about putting our casters in a simple shirt or tunic, is it too much to ask? Apparently so!

Meanwhile...

"But it would be too confusing for other players not to know your class at a glance!" = Me being all and