Artist Sarah Victoria offers a variety of Victorian/Regency Dress Up Dolls. You can customize face and hair features, as well as play costume designer with all of the (many, many) layers of clothes. I particularly like the Regency Hero Dress Up.
Then check out this Wall Street Journal article which discusses the proper layering of Victorian Ladies' clothing and the subsequent undressing that took place at a workshop at the recent Romance Writer's of America convention. This would be a great resource for authors writing in this genre, as well as for readers (like myself) who have trouble picturing some of the articles of clothing in their favorite books.
And a note to all of our Historical fans out there - I will be making an effort to put up more reviews in this category. Look for a new one in the next few days which I really enjoyed!