Hello. I'm new to this forum and came here to ask about something I've been trying to read up on lately. I've been reading about the medieval history of East-Central Europe (Poland, Bohemia, Lithuania, Ruthenia area). I came across a few illustrations of Lithuanian armor that appears to be pretty unique that I've been trying to find out more on. To me, all appear to be portraying the same kind of cuirass, but I could be wrong. Unfortunately, some of the images are illustrations made centuries after the relevant period, but some are from the period. So I would like to ask if anyone here knows anything about this. Thank you.

(Duke Sigismund Korybut and entourage in the Hussite Wars 1430s, 1443 illustration)

(Grand Duke Algirdas of Lithuania 1370s, 1578 illustration)

(Lithuanians Warriors, mostly the one furthest to the left, Battle of Grunwald 1410, modern illustration) - I did have the text in the image translated into English, but it didn't help much