>>95893322
>Core rulebook, pg.340: Only a model that is already equipped with (or that has the option to be equipped with) armour, a shield or barding may purchase a magical equivalent.
A Necromancer cannot be equipped a mundane suit of armour, thus cannot take a magical equivalent unless stated otherwise, like the armour of tarnus, the flayed hauberk does not state otherwise, thus Necromancers cannot take the flayed hauberk