[MargaretR]

I was a teen in the 50's. Remember teddy boys - I have found this on a websearch:-

"As with most young people, they tended to go around in groups, often described as gangs and considered to be “ready to rumble”, being well provided with ingenious weaponry. Legend has it that razor blades were hidden in the peaks of the caps, slipped under the stitching. Bicycle chains were draped under the lapels, ready to whip out and injure an opponent. Fish hooks would be concealed inside the velvet lapel tops, so anyone grasping this part of the apparel would find themselves stuck, with the hooks in their hands, enabling the Teddy Boy to deliver a disabling head-butt straight at their enemy!"

There's sadly 'nothing new under the sun'