Most visually impressive gang in the film, for me, would be 'The Judged'.
I've been thinkin' bout how to do it,
I'd paint something like this:
one 'Drifter'/moto-style leather jacket:

to look like something like this:

paint my bonce in this fashion:

Add he words 'Full Mental Jacket' ,on the back,
a single kneepad
& perhaps a mohawk*,
with a tag on the trousers 'Made by Maybe: MC1'
for some of your bona fide comic references, and Hey Presto!- Robert's your avuncular relative...
(*
mohawk could work with this helmet/make-up thing, as 'the respirator')