I would like to see the possibility to put stats of one armor onto another for visual reasons. Only in case of similar armors however, heavy to heavy and so.
To the "make armor invisible", I'm a bit torn. If you like the appearance of not having it visible, you should perhaps suffer from the disadvantages? My main (elf) always goes barefoot, he has to deal with the loss of stats.
Or maybe not? There are some reality advantages of not wearing armor which are not simulated in the game, so you have only disadvantages not to wear armor. So maybe make it possible to make them invisible.