A good first start is Wikipedia's series on fashion history [link] ... It is surprisingly exhaustive, and also well-illustrated. The public library in Wiehl got a facsimile of a 19th Century illustrated book on the history of "costumes", but it is highly romantic with a focus on national costumes, and another book on 18th and 19th Century military uniforms of Europe, which is better. Other than that, I'd recommend looking for reenactor sites -- since most reenactors tailor their own clothes, and pay heavy attention to period-appropriate techniques, it can give you quite some info. Other than that, how about having a look around the history section of your university's library? There ought to be something, perhaps under "cultural history" or "social history". Though it's possible there is a section dedicated to fashion design.