Lorica plumata (Latin: lorica plumata) is an ancient Roman scale armor. The name is associated with the word plūma ("feather") and literally means "feathery shell" — because of the similarity of its elongated plates with ribs in the middle with bird feathers. The ancient Roman name of the armor is unknown, the expression lorica plumata was given by modern scientists.
The main difference from lorica squamata is usually in the shape of the scales, which should resemble feathers more than fish scales. Classification of armor according to the shape of scales is quite subjective, since there are no characteristic features that would allow attributing armor to any type. There is also a version that the lorica plumata was a combination of two armor — hamata and squamata, that is, the scales were attached to chain mail armor. Today, this type of armor is often called lorica hamata-squamata-scale-chain armor.