It's not the Hero's Journey so much as the Hero's Transformation.
The physical journey stimulates a psychological change that is reflected in the Hero's behaviour, attitudes, beliefs and clothing.
For example, in Annie Hall (1977), The Godfather (1972) and Star Wars (1977), the Heroes are dressed differently, think differently and have different attitudes at the start and at the end.
A story IS the process of guiding them through one state to another.
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