Gintoki was thrown in prison after being framed, and while he's made an enemy of the warden, he's managed to become the boss of the prisoners.  With his underling Shachi in tow, Gintoki skips his menial labor duties to search the warden's room for anything incriminating.  Understanding that the punishment will be fatal if they are caught, Gintoki disguises himself by putting on pajamas...
The only difference is you're wearing a western style prison uniform
¡La única diferencia es que tienes puesto el uniforme de un prisionero occidental