Not sure why you removed both the regular and Elite versions of Outcast’s Void Vestments, but could you kindly add them back into the game. And if this site is mistaken http://grimdawn.wikia.com/wiki/Chest_Armor and they never were in the game, can you go ahead and just add them in.
As it is right now you have only 1 Chaos based caster Epic ChestChest Cloth of Unspeakable Invocation and its only level 50 
You have zero Legendary chaos based caster chests. Sure you have Clairvoyant’s Robe, but it has that annoying stat Converts chaos damage into Aether damage making it way more suited for Aether damage.
Your only other option is to farm Bloodsworn Vestments or standard robes, but that is completely random for you to get what you are looking for. Could take months or you might get lucky and find a good 1 in a few hours.