You could turn clothing descriptions into embeddings and have a fashion vector database, but doing that would mostly just net you the ability to find adjacent clothings, rather than the ability to navigate available clothing or clothing fitting certain requirements.

What was done is more like using the LLM as a personal assistant that doing long manual labor to find what you might be looking for.

This way of shopping is already a thing. "Hype and investment" goes into how the companies can monetize AI harder (ads! integrated LLM shopping! business development! premium pro max enterprise data policies!), it doesn't really focus much on how the individual can save time and money through non-flashy tasks.