How can I get breadcrumbs to show up in product listing searches?

MarketPress network of shops; Pro3 theme.

I have hidden page headers in my site css, as I feel they are redundant. (Blog Post titles are an exception.)

I would like to show breadcrumbs in product category/tag searches if possible.

I have tried to isolate the css for the product listing page with no luck.

Product-listing sample.