How did it work there?
First, you need to enchant an amulet with a constant effect to summon Bound
Boots/Cuirass/Gauntlets/etc. The bound item type should be the same type as the equipment
you want to dupe. So if you want two pairs of Boots of Blinding Speed, you'd enchant the
amulet with Constant Effect: Bound Boots. This will require a Golden Saint or Ascended
Sleeper and small bit of gold. Equip the item you want to dupe, then put on the amulet.
The bound equipment will replace the soon-to-be-duped equipment. Then manually equip the
armor you want to dupe over the Bound equipment.
I believe there was an easier way to do it though. Its been a while since playing Morrowind though and Im old.
Duping and binding is basically something for console gamers.