Or is it some kind of general everybody gets a new look for the reboot thing except apparently Flash and Green Lantern.
They were redesigned somewhat as well.
Of course, Hal's outfit had already been revamped as part of the "Rebirth" storyline by Geoff Johns. The redesign was mainly to eliminate the green crotch area of his outfit that made it resemble a leotard over tights - the equivalent of getting rid of Superman's red Speedo.
That was about nine years ago and no, of course the design hasn't reverted to the so-called "classic."