A vyre noble top (unscented) is a piece of a vyre noble disguise which has not been scented with the blood of a vyre noble. It is obtained by giving Polmafi Ferdygris a vyrewatch outfit during Sins of the Father. After obtaining it from Polmafi, it can be found in a chest within the Myreque Hideout.
It must be brought during the fight with Damien Leucurte in order for it to become a vyre noble top.
When inspected, the chatbox states "The top of a vyre noble disguise. It needs to be scented with vampyre blood before it can be used."