From late 1940s - early 1960s; Manchester UK

Girls were active participants in skipping, boys merely sometime interested observers - the following skipping rhyme gives a clue. Each line was accompanied by appropriate actions:

I ca do the turn around
I can do the splits
I can do the crouch down
Picking up sticks
I can do the hootchy-cootch
Sister showed me how
The girls show their knickers
And the boys say, "Wow!"

A flash of female knickers [underpants] was a BIG DEAL in those [slightly] more innocent times!

.................................

A retort after name-calling:

Same to you wi' knobs on
Y' walk around wi' clogs on
Dad's still got his whiskers on
An' you wi' dirty knickers on

So witty we were ...