[Say, it isn't that bad!]

Originally Posted by Anthony

A level III steel plate is not dramatically different from a breastplate, they're generally 1/4" (6.3mm).

Unfortunately, I don't know what "level III steel plate" is.

Assume my level of armour knowledge is "watching videos by Lindy Beige, Scholagladatoria, Skallagrim, et al, and Demolition Ranch on Youtube." and you won't be far off. ;)

Edit: If level III steel plate is listed in low-tech, I'm still chewing my way through the tech books.