For all of you asking about good costuming resources in regards to my historical Disney princesses, here's an initial list:
ON THE INTERNET!
Demode Couture (There are so many links I could post that are already compiled and organized beautifully on Kendra VanCleave's site. Absolutely worth your time.) http://demodecouture.com/links/
The Costumer's Manifesto (cluttered but deep, lots of good links hidden away in the fray) http://www.costumes.org/
Wikipedia (surprisingly useful! Great for when you're trying to initially pin down a period.) http://en.wikipedia.org/wiki/History_of_Western_fashion
For some unadulterated extant dress porn, Tumblr is a fantastic point of reference:
Some great overview/survey books:
A History of Costume http://www.amazon.com/History-Costume-Carl-Kohler/dp/04862103