The stuffed collar uniform is an item of clothing in some video games. It can only be worn by male characters. The female alternative is the sailor uniform.
In Yu-Gi-Oh! 5D's World Championship 2009: Stardust Accelerator, it can be unlocked by unlocking all Tag opponents in World Championship Mode.
Reverse of Arcadia
In Yu-Gi-Oh! 5D's World Championship 2010: Reverse of Arcadia, it can be found in the puzzle room of Zeman's castle.
Over the Nexus
In Yu-Gi-Oh! 5D's World Championship 2011: Over the Nexus, it can be found in the Duel Monsters Spirit World.
Kazuhiro wears a blue-colored version of this outfit.