Here are some sites that can be really helpful. You may already know these:
www.trulyvictorian.com: this is THE place for patterns. A couple of them are more advanced than others, but for the most part, the basic patterns will get you everything you need.

www.rivercrossings.com: this site is run by Miss Tabetha and her husband Mountain Mike. While 90% if their goods are leather and buckskin, she has developed a model of the cage bustle (the one that will hold up any material short of concrete for that late Bustle look.)