Wear a disguise? No.
Trying to cover myself with hoodies, caps, sunglasses, scarves etc would make me feel more conspicuous. To nosy neighbours I believe it would look even more like I'm trying to hide something. If I did bump into friends or relatives I think they would notice the difference to my dress style and "fashion sense" (Some of them think I'm so tight they comment if they even notice me wearing a new shirt!).
A couple of weeks ago I had a moment of paranoia leaving a punt in a modern block of apartments. As the lift opened onto the lobby I saw a man standing opposite the the lift doors playing with his phone. He didn't get on the lift after me, just hung around in the lobby. Plus, it looked like he could have been holding the phone up high to take a photo, the paparazzi had caught me!
But, If he was taking a photo what the fuck would it show? A guy coming out of a lift? How incriminating! He could just as easily have been the next punter waiting for a message to say he could come up now. Or even a civvie guy so short sighted he had to hold the phone upto his face.
I don't have anything to loose from being outed apart from the personal embarrassment. However, I do value my privacy and over the past few years I have become much more aware of the prevalence of cameras recording so much of what everyone is doing at every moment of the day. Highlighted even more this Christmas when the top of a lot of gift lists included dashcams or even internal security camera systems.
If a WG was inclined to blackmail punters with captured photo's or video's it's now easier than ever. As has already been mentioned the best defence is a using a punting phone, a punting name and keeping any social media you use tightly locked up.
Unless you happen to be famous, then you probably are screwed.