If it isn't flashy it looks nothing like something a silent assassin would wear. The one set that does look like something a shinobi would wear from head to toe is not stealthy. If we aren't going to get a regular leather assassin-looking outfit can we at least lose the chain rattling on the Ninja Chainmail? We are Ninja for the gods' sake! We have enough skill to walk around without rattling the chainmail and giving ourselves away...
TL;DR version: Square Enix, please give us some black cloth/leather Ninja Body gear with a nice head piece to veil our face (kind of like how Ninja Hatsuburi does) or remove the chain rattling sound made when we walk while wearing/glamoured wearing Ninja Chainmail.