I think it's difficult to state like this if you are going after reallife. Ninja (Shinobi and Kunoichi) literally don't have body armor or else, just a few chains or leather plates on some places to prevent if you getting into a fight, if you get hit by a sword you don't immediatelly get cut in half. They are used to be silent assasins and not for a battlefield after all. (btw. don't think of the wrong claim which happened in the 80th around, because they didn't know how it really worked. Kunoichi is bassically just typical title for female Ninja, NOT this shît which got stated because there was a time, female Ninjas did go whoring to kill their target just before they were about to do it, this got nothing to do with this title itself) And the underboob outfit of the valk is hardly like a bikini, but why got she that much durabillity? xD Think of fantasy MMO blackmagic/stone energy which is giving the outfit some def which is working like a second skin.