Crikey!,
I wasn't even wearing Hi-Vis the last time something like this occurred......
Back in the day, myself and a fellow fire-fighter were at the local DIY "Mega-store" (as they call it here) for a charity sausage sizzle and a PR event about fire safety.
We were wearing what we call our "undress uniform" (formal gear), an elderly lady ran up to me and said "Officer, can you please arrest this young man here, he tried to steal my hand-bag!!"
She had the kid by the ear grin and I said that I probably could if I was in fact a police officer, but no I'm just a Fire officer.
I did call the police via our fire appliance and the kid got a good telling off and a clip around the ear from one of the local policemen.
About two years later the Fire Service here changed the colour of our shirts from light blue to dark blue, mainly because of the confusion from the public, some FF's were being targeted as police officers. crazy