I'd like to see some new armor pieces added, both for some variety for everyone and to support non-humanoid characters dragging around really wacky looks.
The mechanics for armor should remain the same - the new pieces would just introduce some more options with similar stats. They could even be copies of existing pieces with name variations, for example:
Bracers: same weight/type/stats as Leather Jacket.
Barding: same weight/type/stats as Gothic Plate.
Some non-humanoid friendly armor suggestions:
Bracers
Helm
Pauldrons
Greaves
Gorget
Cloak
Vest
Circlet
Harness
Barding