Europe Trade Moderator
I think the most effective (not the most powerful) armor for a cold sorc is...
Skullder's + ptopaz.
She doesn't need what the other armors offer for doing the usual cold sorc busineess (which is p3 Meph, p3 Andy, p1 Tunnels, p1 Pindle, p7 LK), making it a splendid inventory slot for an MF item and Skullder's is the King Kong among MF armor. I usually try to have resists in the positives with her, but not much beyond that. She's L95 and in spite of my bad reflexes and tendency to panic in surprise situations, she, she earns more XP than she loses from dying.