Chaos Armour grants the wearer a 4+ armour save. This can be combined with other equipment as normal. A Wizard can wear Chaos Armour and still cast spells.
Source: Warhammer Fantasy: 8th Edition
Chaos Armour grants the wearer a 4+ armour save. This can be combined with other equipment as normal. A Wizard can wear Chaos Armour and still cast spells.