IMO, getting hung up on ‘screen accurate’ materials is where you’re going to fall down. Especially in your price point. If you want the right look, focus first on fit and execution and find similar materials and finishes that fit your budget.
I would recommend, depending on the level of stretch/compression you need, jumbo spandex on the matte side or ponte for the suit. gabardine is a broad category and you want to ensure you get a fabric with a good hand and that can color match the boots and trunks and emblem. The key thing with the cape is the structure. Ensure you have a maker who knows how it should be made and integrate with the suit.
That suit looks quite simple, but there a a lot of factors to consider, and they add up. HTH and good luck with the build.