Stuff from my weak google-fu:
A good resource for guideline pics.
A little bit of rules... sort of. A good explanation for it.
another explanation post about some of the main styles seen.
might be something on this forum.
I didn't look too hard into the links so I'm not sure which ones are informative or not. But, fudge, it look like there's another fashion style to add to my list *stares forlornly at bank account*
It all looks very mori+luxury. Definitely inspired from historical pieces... a lot of it looks European...
Hm, couldn't find anything on the site about not posting links. So I hope this is okay!