Duncan Idaho (played by Jason Momoa) is a swordmaster in the service of House Atreides.  In Dune, Duncan helps train Paul Atreides before his death.  In the 2021 film, Duncan has long wavy hair and a muscular build.  He often wears a stillsuit after moving to Arrakis in the service of Duke Leto.  To make your own stillsuit, you may need to get a little creative, as padded pieces that look the part are often the wrong color.  Don't be afraid to experiment with a little spray paint to get the look you want.  Duncan also wears more casual clothing when training Paul, and any costume will be enhanced with a short, straight sword to help look the part.

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