Oh wait, are you talking about the visor of the ODST in the pictures in that thread? Because if so, the ODST isn't my costume. Weta desinged and produced them for the Halo short films.
But, you could make the visor from vaccum foruming (ODST), a normal motercycle helmet mask (Master chief), a Binder (any), prety much anything that is clear, or the colour you want the visor to be.