House of Worth, 1896
Paul Poiret, 1913
and OMG that dress!, which is a blog dedicated to posting images of historical fashion from institutions from all over the world.
Jacques Fath, 1953, The Kyoto Costume Institute
The images in these digital collections are gorgeous and include centuries of history. So even if you are not looking for academic purposes, just browsing for the sake of your eyeballs is a good reason too.