Categories Navigation

Hi,
i would like to know if there is a way to let the users know how my categories gerarchy is made. I try to explain:
lets say i have, under the “places” category, a parent category named “dresses shops”, with two children categories named “black dresses shops” and “white dresses shops”. If someone see in the home page a listing placed in “black dresses shop” and click it, how can i make him knows there is the “white dresses shops” category also? And, in the same way, if someone click on a link of the parent directory, the site will shows all the listings placed in that category and in the children categories, but they will be all merged, and i don’t see nothing that suggest they are organized in sub-categories. I partially solved writing a sort of breadcrumb in the categories description, like “dresses shops > black dresses shop ” , but this can only let the user there is a upper category (without a link to reach it anyway) but he will never know if there are other categories on same level, or at sub-levels. I hope i explained myself, and hope you can help me. Regards