As you may know, E-2 Robin's costume (as shown on the action figure above) was designed by Neal Adams back in the mid-70s as a possible replacement for (Earth-1) Dick Grayson's bare-legged look. Even then the marketing department was becoming a force to be reckoned with, however, and no doubt thinking of all those Mego dolls, sheet sets and SuperFriends lunchboxes on the shelves, DC opted to keep poor Dick in his officially licensed shortpants well into his 20s.
Earth-2 Robin inherited his outfit, instead. Which was okay because his first suit was, as noted above, pretty much an eyesore.
Anyway, I never could get used to a gray-haired Robin in that Adams outfit, as it was obviously intended for a more youthful character.