I imagine that I must be late to the bandwagon on this because I can't believe I didn't know this existed. It is the combination of google/amazon/library of congress. You can look through and download all kinds of books whose copyrights have long since expired. Here is a link to their dress making books. I have yet to try pattern making as a search heading but sewing turns up a lot of Samplers and embroidery instruction.
Have fun and praise the gods of the internet.