Don't want to labour this point too much (!) but, while I've read this theory about stagehands, ninja experts in Japan - such as people like Hiromitsu Kuroi who advises the Ninja Museum in Iga - DO insist that ninja sometimes wore an outfit that was simply modified summer peasant garb: loosely fitting and covering up as much exposed skin as possible, including the face, in order to protect from mosquitoes (which are an utter nightmare in Japan in summer).
What I should have said is that Hiromitsu etc say the garb was dark blue not black as the latter really sticks out in bright moonlight. The black colour seems to have been a later invention but not the actual outfit itself. So keep the miniatures but paint them dark blue!