It's a great suggestion but the reason probably you haven't gotten any response from the devs is because it's not feasable progam game wise.
You can't have individual sounds for PIECES of armor but you can have sound for a whole thing for example a HORSE. If you're ON a horse or if the horse is roaming around the HORSE has its own sound file. There's only one sound file for a person, the walking/running sound probably. You can't have individual sound files for pieces or items on a character just doesn't work programming wise.
Unless, once someone has any armor type item on them or if they're fully armored then have a armor sound file, but again that's totally nonprogrammable. It's just not possible from a programmer's standpoint. They would have to add a big ass special programming code just so that can happen.
Plus the devs are just using what has already been programmed(BY Bethesda or whoever CREATED the game) and can't change that. They can add different items and stuff and change textures on things. They could even replace a sound file for example of the HORSE and change it to a PIG so instead of the horse sound you have snorting, lol. They can't change something that in-depth. Don't think they get in there and make massive code changing, the game is kind of set already and can only be embellished a bit.
BUT AN AWESOME SUGGESTION! I hate all those armored bastards especially when I'm not wearing my armor and have a pike and hand axe only, lol.