This song is about true identity. It was written at a time when your destiny was chosen for you based on your background and education or lack of it. Ambition and individuality were often stifled, you had to fight to be who you wanted to be.
Our inner self consists of hidden personas, like Russian dolls. The different facets of our personality are often revealed in extreme situations. And they can be good or bad because the circumstance dictates your reaction.
In an age of social media we show a public facade. Often people are afraid to show their true self, and this is about having the courage to be authentic, to be the person you really are.