Thanks to Abbyelyn on the Historical Sewing forum I just found out that Colonial Williamsburg are putting their collection online! There are lots of clothes but also portraits, prints, furniture and so on. Everything is accompanied by a very informative text about the item. Unfortunately the pictures are rather small, and I can’t find a way of browsing everything in categories (except the “highlights” selection) rather than having to search (I can’t be sure I haven’t missed something!).
Click the picture to go the collection!
EDIT: I found a way to browse categories. In “Advanced search” choose “classification is” and you’ll be able to choose a category.