Electrochromic was sadly not mentioned in Run & Gun. As of right now, Rules as Written, it's only allowed as an add-on for clothing and armored clothing, but not any of the fashion-armors in the Core Book or Run & Gun, nor as a sub-function of RPC, although it would make sense if it it was.
It's a shame too. I like Electrochromic as a concept between "my shirt is red" and "I'm a Predator like in that movie Predator." Electrochromic armored clothing (define them as Worker's Coveralls) is a go-to item for social infiltration. With a simple matrix search you can get them to match the pattern of what ever kind of worker you need to pretend to be to walk into a building. Matrix-Service-Provider, HVAC, EMT, Pest Control, Janitorial, Locksmith, etc. Add in a clipboard and the appropriate set of tools and no one is likely to question why you need access to the fiber-optics lines, basement, roof, elevator shaft, etc. "Why yes that is a set of lockpicks and maglock sequencers in my toolkit. Hey, your boss's boss, Mr. Vendorn? Well his secretary called me. Apparently she lost the combination to the wall safe and needs me to get that sucker open before Mr. Vendorn fires her. What, did you think I'm world's stupidest thief or that I'm wearing a jumpsuit with 'E-Z-Key' on it because it makes my butt look good?" or the personal favorite: "We're paramedics, there's a CPO on floor 15 having a hear attack! Either get out of our way or accept the backlash when he's dies because you wanted to scan our kits and run our IDs!"
