I don't know if this has been said yet, but moss armor? I'm thinking like, as a decoration layer, obviously. Something like the Moss Knight? (Patchwork Paladin on instagram if you want to see what I'm referring to) Or maybe something ocean themed. Japanese Samurai style armor could be cool too? Specifically lacquerware, and Heian period armors. ō-yoroi (Heavier, more ornate, made for archery) and dō-maru (lighter, easier to move in, more suited to foot soldiers) armor. Haramaki was supposed to be easier to make, and might be better for earlier game armors? Though Haramaki came into play during the Muromachi period if I remember right? But yeah!