Tess talks about how the culture was changing.
Also men and women are very typically in the roles you'd expect.
Hardy wrote this like a romantic novel; thus following typical 19th century plots and conventions.
Sorry I can't help you more. We have Hardy at home but no Tess.
Here is a very interesting link. Read under Historical Context.
http://www.cliffsnotes.com/WileyCDA/LitNote/id-131,pageNum-4.html
Wikipedia mentioned the themes of land and paganism - all good to explore. I'd look at the patterns of class system and inheritance.
You might also enjoy the Victorian Web. It's helped me many a time when I've had questions about various aspects of Victorian literature.
http://www.victorianweb.org/authors/hardy/hardyov.html
especially Themes, Images and Characterisation. And also the various Social and Political Context links.
Leading Questions might help you formulate a topic relating to Hardy and Tess.