Only the common body armors from treasure are dropping with enchants such as silk robe[1], saint's robe[1], and chain mail[1].
The castle specific body armors are dropping without enchants.
For example:
Tights[1] from Luina 5
Formal suit[1] from Luina 3
Thief clothes[1] from Balder 1
Ninja suit[1] from Balder 3
Robe of cast[1] from Brit 3
Legion plate[1] from Valk 1