Just wanted to share two sources of inspiration.
La Mode Illustree is an LJ comunity where the members post Fashion plates, paintings and photographs spanning many centuries. Most members are good about taging the images with the eras they come from.
So check out the tag page if you are not up to a walk through the history of fashion.
Historic Children's Clothing and Costuming is an LJ community to discus the many aspects of historic costume for children. This extends to Maternity and Nursing costume for mothers, as well as non clothing items for the children. The tag page will be helpful.
Both of these communities may have posts that are locked to members only.