the mandalorian cosplay costume

During the escape, Dameron asks the stormtrooper his name, to which he explains that he has been raised from birth to be a stormtrooper, and the serial number “FN-2187” is the only designation he has ever had. Concentrating, Rey tries one last time, and the stormtrooper listens to her demands. Finn likes the name, cosplay costumes and goes on to use it.