Ok, you know your armour effects your fatigue from magic use. Heavy armour, you run out of magic power faster, blahblahblah.
Problem was, you have heavy armour, light boots, medium gloves and no helm.... huhwha?
So. Now the ONLY type of armour with a rating on it is the torso armour. That is the ONLY armour you need to consider your Brawn for, the ONLY armour that influences fatigue.
The other things, boots, gloves and helms are free game. Much simpler.