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The armour they are wearing is called tonlet, basically tournament armour. The boxart is taken from a painting "The Battle of Orsha" (poland/Lithuania versus Moscow
In this Thesis on the painting
http://www.riha-journal.org/articles/2014/2014-jul-sep/hucul-orsha-en
it´s suggested that while this type of armour would be unlikely it could of possibly be used on a battlefield..but Landsknechts in such armour???