How did you manage to remove it? It's not an item that can be added/removed to the inventory. I searched for it on the GECK and I can't find it, maybe someone with more knowledge than me can find it.
Before messing with a save file you should always backup your saves.
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I am looking for AC Odysset armor and outfits assets to port to FNV, if you know where I can get them, PM/email me.