As Magneto mentioned.. it is probably the speed force style To get a similiar vibe/feel to the NPC look in the pic, i'm thinking try out some Mats or chromas on it ? Maybe that is what you saw.. ppl adding a Mat to it ??? Can you descibe it a bit more?Was it on the back only? or ???
I agree - I thought the OP knew that and was saying OTHERS were wearing a similiar look.. maybe I misunderstood OP lol
Hmm.. did you take this screenshot in Anti-Matter Metropolis? The color looks like it's from the Impassioned Chroma Box that is available during the Valentine's Day Event. The style isn't familiar to me.