The "piece" you are likely looking for is a designed for cosplay or Halloween:
Typically includes a one-piece jumpsuit and a matching eye mask. GOTHAM KNIGHTS(202)
A full-body jumpsuit featuring the blue bird emblem and tactical armor detailing seen in the game's default "New Guard" suit. The "piece" you are likely looking for is
The search result for primarily refers to a specific Nightwing Cosplay Costume (Fantasia Masculina de Cosplay Nightwing) inspired by the 2022 Gotham Knights video game . This item is frequently listed on retail platforms like Mercado Livre . Product Details GOTHAM KNIGHTS(202)
Nightwing (Dick Grayson) from the Gotham Knights video game.
If you are looking for information about the source material rather than the costume: