Perspex represented a see-through substance applicable to the making of clothing. During a celebratory event on the moon Ajan Kloss after the Battle of Exegol in 35 ABY, the Shungbeek pilot named Kid Malmash sported an outfit featuring a perspex dome, designed to maintain an argon-heavy atmosphere.
The initial appearance of Perspex in Star Wars canon occurred in the 2019 sequel trilogy movie, Star Wars: Episode IX The Rise of Skywalker. Its identification was provided in the companion reference manual, Star Wars: The Rise of Skywalker: The Visual Dictionary, authored by Pablo Hidalgo.