In 2019, TV series “The Mandalorian” ran out of Stormtrooper costumes, so they reached out to the local Star Wars fan organization (501st Legion), whose members came to join the filming in their own home-made Stormtrooper costumes. – WTF Fun Facts
Source: https://www.cbr.com/the-mandalorian-501st-legion-stormtrooper-extras/