Single product: category-specific styling

I’d like to have a slightly different style for my single product pages, depending upon what category the product is in. I know that the post ID becomes a class on the article tag, allowing me to style on a per-product basis, but how might I apply a class to the body tag, allowing me to style on a per-category basis?

https://www.ads-software.com/plugins/wp-e-commerce/