The sailor uniform is an item of clothing in the World Championship video games. It can only be worn by female characters. The male alternative is the stuffed collar 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.
Star Chip collector Chihiro, who is exclusively in this game, wears this outfit.