I am trying to look through the skyrim wikia page , I see Nightingale armor (Looks cool) but the stats on half of it are actually innapropriate... I do wonder can you disenchant armor and then put the stats on top of armor that already has stats then? Or can you only move the stats to blank generic armors?
Like I said, I could be wrong, but I am 99% sure you can't disenchant it. I know i have disenchanted many items before and had brotherhood armor in my inventory and it was not an option.
Edit: just do what I do, I kept like 2 items from his amor, and use them sparingly only when i need them.