What is "scaled armor" sounds new .
Here is how I interpret the Smithing perks
Smithing (general skill): You can create types of iron armor/weapon depending on your resources and you can improve ANY armor/weapon.
[blank] Smithing: Getting a material specific perk allows you to create items from that material and bumps the improvement level for that type up by double
Advanced Smithing: Note it says create "scaled and plate armor". My optimistic translation of this is that most/all material types have DIFFERENT ARMOR TYPES (i.e. studded, chain, mail, scale, briastplate, plate, etc. etc.). This is the only way this perk makes sense. It cannot mean that it allows you to make armor from dragon scales/plates because that is already the "Dragon Smithing" perk. I hope this is true because that means we might get ~3-6 variations of some or each material