The Russo Brothers did in fact confirm that every scene involving the Black Panther outfit was a CG outfit.
“It’s impossible when you’re talking about an otherworldly outfit like the one that the Panther wears, which has a certain luminescence to it because it’s made of a woven metal. We could never afford to construct an outfit like that that an actor or a stunt player could move around in without sweating to death or that would capture the luminescence that we need. So what we ended up doing in post is ILM came in and painted over Chadwick and the stuntman. The outfit is completely CG.”