Sports Films : Question about clothing in martial arts.

Question about clothing in martial arts.

In movies, shows and real life tournaments, I've seen fighters wearing light clothes. I've even seen men without shirts and shoes. I know that's for speed, but does it mean they can't be fast enough with heavy clothes? I mean, I've seen a few tokusatsu movies and shows where the choreography isn't as... "complex". Is it because the actors/stunt doubles are wearing super suits (specially the metallic ones)? What about masks and helmets? Those affect visibility, right?
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