The beatles appeared in jeans and sucked black leather. Epstein made them change their jeans and the leather sucks for the suit and the tie. Epstein convinced them to dress in a better way and also to do something so elemental today as a synchronized bow at the end of each performance to say goodbye to the public. 

The bright colors and patterns defined them during the presentations of the disks. In the late 60's the aesthetic on which they were based was simpler. During this season John Lennon popularized his classic white suit. In their styles they emphasized the Hindu culture and they did not care the appearance. The beards, considerably long, and hair with a careless touch, reflected the hippie style.