All of the above are good points; if you want a generic 'Hollywood/Hammer Horror Transylvania', a mix of the Westwind 'Vampire Wars' figs with Evil Cossacks, Gypsies and whatnot (including the odd West European civilian) should do the trick. Nothing says 'Transylvania' like a beard and a fur hat.
It's true that different areas have different peasant fashions, because rural areas tend to be conservative; however, the further down the social scale you go the less 'fashionable' clothes tend to be, so you might get away with using some generic 18th figures in frock coats and breeches or those dresses with square-cut bodices as 19th rural dwellers; even some late 17th figures such as Pilgrim Fathers types (probably not the pilgrim hat, but if you can get hatless men in breeches, shirts and waistcoats).