you can get the robe and shoes if you press '~' and write coc testinghall. and the amulet is when the emperor gives it to you you click "~" again and write player.createfullactorcopy and then kill your clone and search for the amulet and get it and then put it on.
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~player.additem (emperor robes id) 1
to get the robes...find the item id on UESPWiki