Focusing on the aesthetic:
* Trend: This emphasizes the current fashion or popular style of change.
* Aesthetic: This highlights the visual or artistic appeal of how things are changing.
* Form: This focuses on the outward structure and shape of the change.
Focusing on the evolution:
* Evolution: This describes the gradual process of change over time.
* Transformation: This emphasizes a significant and often dramatic change.
* Progression: This indicates a forward movement or development.
* Flux: This suggests constant and unpredictable change.
Combining both:
* Evolving style: This directly combines the concept of change with the concept of aesthetic.
* Shifting aesthetic: This emphasizes the movement and transformation of the style.
* Dynamic form: This highlights the changing structure and movement of the style.
Ultimately, the best word will depend on the specific context and the exact meaning you want to convey.