The hero garb is an unlockable outfit in Grand Theft Auto: Liberty City Stories for protagonist Toni Cipriani.
The hero garb is clearly modeled as a brightly colored superhero costume, consisting of a red bodysuit with yellow stripes down the sides and a large yellow "T" (presumably for "Toni"), a yellow spandex worn over the bodysuit, brown oversized gloves, red high-top boots, a brown utility belt, and a black mask with goggles.
The hero garb is a reward item added to the player wardrobe upon completion of all Avenging Angels side missions in all three islands of the city. The garb's color scheme and design is clearly intended to match with the Avenger motorbike, which is unlocked after completing the Portland section of the Avenging Angels side missions.
Like other clothes in the game, changing into the outfit will remove up to a two star wanted level.