Little known fact, Paul McCartney is barefoot in that picture. Some people say it was to symbolise his death, but actually it’s because he was from Liverpool and they hadn’t heard of shoes there. John, Ringo and George were all really from Manchester and were early adopters of shoes, which were invented in a shoemakers* in Bury in 1962
* cobblers, some may say.
Of course people weren’t forced to go barefoot prior to that, but there was a fear that if Paul had been wearing his sparking clogs he’d possibly have set fire to his flares, the bottoms of which had been soaked in LSD. Which was invented by another famous Mancunian, Bertie Hoffmann, in a secret lab under the Nationwide in Altricham. And without that LSD, Sgt Pepper would never have been recorded.