Angus Young still wears the costume on stage to this day. AC/DC was a representation of the working class angst in England and they represented swimmingly.
AC/DC: Why Angus Young Wears A School Boy Outfit
https://gnrcentral.com/2020/11/07/ac-dc-why-angus-young-wears-a-school-boy-outfit/
In case you haven’t noticed, numberonepal, judging from several posts, is quite the rocker!
Didn’t Angus Young die recently?