I’m pretty sure that Gucci Princetown mules was the kindling to this.
… and Isabel Marant’s Mirvin shoes was the match that must have lit it up.
All I know for sure is that a slew of designers (Marni, J.W. Anderson, and by the time this goes to publication, multiple others…) are putting out their interpretations of a classic clog:
The Birkenstock Boston.