Chow was not involved with the production of season 2. That said, McGregor’s camera tests probably happened during the filming of The Mandalorian’s first season. Regardless, McGregor hasn’t worn Jedi robes in about 15 years (since filming Star Wars: Revenge of the Sith), so it makes sense that he would be excited to see his “old costume.” It’s interesting that he apparently tested in the same Obi-Wan costume from Episode III. The robes Obi-Wan wears on Tatooine will likely be different, or at least resemble Alec Guinness’ outfit from Star Wars: A New Hope.
McGregor could be wearing his “old costume” to film flashbacks to The Clone Wars with Christensen as Obi-Wan laments Anakin’s transformation into Darth Vader. Putting McGregor’s acting chops front and center, the Obi-Wan Kenobi series should feature an Obi-Wan tormented by his failure as a mentor and friend. For many, McGregor was one of the best (and underutilized) things about the prequels. Imagining him in beige clocks, wielding a blue lightsaber once again is moving, even if we have to wait until 2022 to see the Disney+ series.
Source: Happy Sad Confused!
Originally from https://screenrant.com/ewan-mcgregor-obi-wan-kenobi-costume-mandalorian-set/