All of the characters of Unconnected Marketeers have pretty different fashion sense. Seems like Sir.ZUN ran out of ideas.
Wouldn't that mean the opposite? If he were out of ideas, they'd all look the same, or there'd even be no game at all. And how many 2hus, that aren't related in some way, actually wear similar clothes?
After a bit of time, I realized why she got her art first of other new girls, she's Fox Girl, andddd compared to other new girls, her cloth is like easiest to draw.
Funny thing, this is actually the second time we see a kuda-gitsune. The first time was in WaHH; remember fox Marisa? Her design is definitely on the simpler, slender side. Since the species is usually kept in a pipe, she's probably meant to evoke that sort of feeling.