jReviews :: Customer support forum

The only thing remotely similar you can do with jReviews is to forget about the traditional sense of the word category and use it only in conjunction with a tagging or virtual category approach.

1) You create your main section with designer and boutique categories.
2) You create a multiple select list for boutiques, which are somewhat redundant for boutique names used in titles. And assign this field to designers. When a new designer is created you can choose the boutiques and have them show up as links. You can modify those links so they work as a search link showing the list page with the designer, not the designer detailed page itself.
3) To have designer articles show up in a boutique you'd have to use the related items module that comes with Joomla and make sure to fill the meta keywords for both designer and boutique.
4) Shoes and hats. Use checkbox or multiple select custom fields to list what type of items a boutique carries and works similar to the other field.

This isn't a perfect solution and you'll need to work on it, perhaps customize a few things here and there, but it might be a good start. Download the trial and check it out. Or play with the demo.