Could work. Traditionally, Wizards are meant to have low armour for the reason that their spells are so powerful. They should use magical means to off-set the damage.
Perhaps an expensive light-weight armour or one that provides a spell bonus in Shield spells.
Yes. Normally wizards should not wear armor. But I think they could have at least some different fancy clothings. At least a hooded black robe!
And since a traditional plate mail is so heavy that you can barely lift it, I see no reason why a weak, old man can wear it. Plus the helm muffles your voice ;0).
I am very interested to see what Larian made with the stat system: usually thieves wear leather armor but in DD the leather armor sets were ignored. Plus why need you to use leather if you can add a bit to strenght and wear plate? Still I find it difficult to imagine a rogue creeping in the dark wearing a shiny, ringing chain mail.
