Fun I actually did a similar project during my time at UVic 10 years ago but it was a hoodie.

https://youtu.be/-LMZxSWGLSQ

I remember thinking really hard on what to do with color. Except like you say mine is pretty much a naive fft.

https://github.com/aleksiy325/PiSpectrumHoodie?tab=readme-ov...

Thanks for reminding me.