Yes. The wearer of the Wizarding Hat is not actually a Wizard – their magical powers are granted by a haunted hat which is not affected by any armour the model may wear.
Source: Warhammer: The Old World Online Rules Index
Magic Items - Frequently Asked QuestionsURL Copied!
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Can the wearer of the Wizarding Hat cast spells whilst wearing armour?URL Copied!
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Source: Official Warhammer: The Old World FAQ & Errata - Version 1.2
Can the wearer of the Wizarding Hat also wear a magic helmet, such as the Bedazzling Helm?URL Copied!
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Yes, because one is an enchanted item, the other is a type of magic armour, but we hope anyone equipping a model in such a way would make the effort to depict it wearing two hats!
Source: Official Warhammer: The Old World FAQ & Errata - Version 1.2
Do potions affect a model's mount?URL Copied!
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No.
Source: Official Warhammer: The Old World FAQ & Errata - Version 1.2
If the Scroll of Transmogrification is successfully used against a Wizard mounted on a ridden monster (a Dragon, for example), what happens to the mount?URL Copied!
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The Wizard is transmogrified, but not their mount. In the example given, you would be left with a Frog riding a Dragon.
Source: Official Warhammer: The Old World FAQ & Errata - Version 1.2
How many spells does a Wizard with an Arcane Familiar know? For example, does a Level 3 Wizard know three spells from two Lores (two from one and one from the other), or six spells, three from each Lore?URL Copied!
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An Arcane Familiar does not increase the number of spells a Wizard knows, it simply allows them to know spells from two Lores. Thus a Level 3 Wizard would know three spells from two Lores.
Source: Official Warhammer: The Old World FAQ & Errata - Version 1.2
Some models can be found in one faction's army list, but can be included in an army made using a composition list belonging to a different faction (Dragon Ogre Shaggoths, for example, can be found in the Beastmen Brayherds army list but can be taken in an army made using the Warriors of Chaos Grand Army composition list). What lists of magic items do such models have access to?URL Copied!
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Models can purchase magic items from the list of common magic items in the Warhammer: the Old World rulebook, or from their own faction's list of magic items. A Dragon Ogre Shaggoth, for example, can purchase items from the common or Beastmen Brayherds magic item lists.
Source: Official Warhammer: The Old World FAQ & Errata - Version 1.2