Some solid responses so far ...
: So you've got a fat folder full of reference, eh? Well, don't just brag about it, upload it for the rest of us (to uploaded.net or such)! Please, pretty please!
: Right you are about the demographics - through the middle ages all the way up to the closing times of the early modern peroid, some 90% to 95% of people lived in villages, in rather simple conditions. The term "the long middle ages", coined by french historian Jacques le Goff, discusses this - as the life of the rural people hardly ever changed in the period from the 3rd till the 18th century.
About the cloth scarcity ... I remember reading a microhistory study about some petty thieves from the 16th century: the broke into a church, stole the tablecloth and made a shirt out of it.
So, what are you? A professional historical stylist of sorts? You do know an awful lot about the subject.
: Yes indeed, dear sir. Because if a culture had only one social class, it would be incredibly flat and boring (its only a modern trend and a "feel-good", believing in that we're all equal (heh, still certainly not true)).
A lot of interesting outcomes comes from different classes interacting: the higher classes usually feel irritaded/annoyed/insulted by the lower classes and so they strive to isolate themselves from the "scum". And the lower classes, they immitate the higher classes, trying to climb upwards the "social ladder".
As a matter of fact, I remember reading another history book (something about the local early modern cities, I think), which mentioned clothing complaints of the townswomen against the village women. Apparently, being a villager restricted a woman from wearing expensive clothes. And if we looked at the townswomen, they weren't allowed to wear expensive jewelry (as that privilege belonged to the noblewomen only).
... and there was an actual law to uphold that.
: Well, I don't know ... the cities you're describing are a little bit extreme (why founding the city in an inadequate location in the first place?)
Wearing human skin? Jeez ... getting all darwinian on you, a standard evolutionary safety pattern for all the existing species is that the members of the species don't brutalize the others of their kind. Wearing human skin, well, you could pull that off, I suppose (a nice sociopath), but you'd be evoking appaling feelings in all the peoples you'd be meeting (and no, this isn't a cultural thing).
Baldur's Gate 2 had this sorts of cloting, obtainable in some tailor quest (evil characters only).
Clothing and architectures are not just voluntary, they are some major highlights to your setting. If you want to search through the tens and hundreds of mediocre settings out there looking for THE ONE setting based on text only differentiation, you'd probably get really overwhelmed real soon.
On the other hand, having a few cool visual references makes the viewer wonder. If there's a match in style, the viewer goes all "wow, what a nice style, I want to know more about it" ... which doesn't happen much in text-only presentations, as all the letters look the same (duh!)
Check this out: Morrowind concept art
(quite a unique game). If only I had such drawing in my setting - it would make wonders, don't ya think?