So this is movie 1 ?
and this is movie 2 ?
The "weave" which has been mentioned appears to be suggestive of asian chain mail, which differed from standard European "4 through 1" chain mail (four links through each link...repeating...each link had four in it regardless) in that Asian mail...er, largely Chinese and Japanese utilized many more links and/or double layers.
Now I cant say for certain what that material is on the movie helmet as the top of the helmet definately has the tell tale clues for mail, ie, the upside down U shapes in a pattern looking like embedded rings.....but the edge betrays its likelyhood of being actual mail....unless as I suspect, its lined with a material that creates a leading edge. (trust me, chain mail hurts when your smacked and it digs into soft flesh
Being involved in multi period historical reenactments (celtic to ECW), document's, and some film project requring armor, Ive seen lots of different materials used to represent chain mail....from rope patterns to cut-up woven rugs....to the plastic rings in LOTR.
This is vaguely the type of mail it appears as though they are suggesting on Shredders helmet:
having said that....I have woven all sorts of mail...but its time consuming.
I have four or five contacts and friends who weave mail with frightening speed and are very reasonable that could make the shroud/domes for these helmets....