Not directly fashion related, but I’m sure fashion students will find the content of some of these historical images useful, particularly costume design students.
The British Library has released 1 million images to Flickr Commons, that can be reused, remixed and repurposed by anybody. Most of the images are taken from 17th, 18th and 19th Century books, which cover a wide range of different subjects.
There are maps:
There are illustrations:
There are also early photographs: