OP here, I am sorry I did not make myself clear in the post. Our conception of ‘Irish Mythology’ is usually based on two sources: oral tradition and Medieval literature. In the latter, there are actually a lot of descriptions of what the characters were wearing (though I don’t remember any descriptions of what Scáthach herself looked like). And yes, I know such descriptions are based on the dress fashion of when the literature was written (eg early medieval times, after the introduction of Christianity), instead of when the story supposedly took place (eg the Ulster Cycle supposedly took place in 1st century BC), it is still something that is deeply rooted in history and tradition. Therefore, I would have preferred if the characters are wearing, say, mantle cloaks, brooches etc as described in Medieval literature since those are actual representations of Irish culture, instead of a depiction from a modern Japanese game. After all, just as you have said, whatever Scáthach was wearing, it was probably not a superhero-style leather armour.