Characters
Well, what’s the point of being a teenager if you can’t dress weird?
— Charlie ‧ Peggy Sue Got Married

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker treats odd clothing as part of what adolescence is for. Being a teenager, in this view, is a time to experiment with looks and be a little ridiculous, so playing it safe with clothes would waste the chance. It is a defence of gleeful, self-expressive weirdness.
Context reviewed