In the past I used to go to work wearing the hi vis coat. I very quickly switched to wearing a normal coat and packing the hi vis, I also use a plain black bag (marauder) and when at work add some first aid logos. I guess I'd be classed as an advanced first aider, I don't like being identified as such unless I'm on the clock. Even when I'm working I've tried to look less like a paramedic as drunk members of the public are very bad at understanding scope of practice. As Joe on the street I'll stop but don't identify myself more then I have to.