Jannath's Hat is a very rare headwear that gives advantage to persuasion and deception checks.
The corner of modern fashion that this hat currently occupies might well be called Optimistic.
Properties
Helmets 
Rarity: Very Rare
Weight: 0.5 kg / 1 lb
Price: 450 gp
Special
The wearer of this item gains:
Advantage on Persuasion Checks.- Advantage on Deception Checks.
Where to find
Looted from High Security Vault n2 in The Counting House