Hmm... arguable whether I'd say that the left hand doesn't look like a human hand; the lack of details and general stylization of the motif makes it hard to tell. My assumption was that it was just a hand with fingers outstretched and turned sideways relative to the perspective of the viewer/artist, and the rest being the feather/fin wrapping around the arm and hand. Still... it hadn't even occurred to me that the thing might not be something on or in her arm, but could be an actual part of her arm. At first I thought it might be an early stage of a [url=https://vignette.wikia.nocookie.net/bloodborne/images/a/a3/Lost_Child_of_Antiquity_concept_art.jpg/revision/latest?cb=20180728134345]lost child of antiquity[/url], but it just doesn't look right for that. Then I thought maybe it was actually a fin, like with the fishmen from the fishing village... but why would Cainhurst venerate those?
Then, playing some more Bloodborne yesterday and finding a certain rune, it hit me: I was thinking too narrowly. I don't think its a feather or a fin anymore; I think it's a leaf. I think the arm bears a striking resemblance to the arms of a [url=https://bloodborne.wiki.fextralife.com/file/Bloodborne/Kos_Parasite_Milkweed_Loch_Shield_Sword_Of_Moonlight_Concept_Art.jpg]cauliflower[/url] Hunter (otherwise known as Lumenwood Kin) that you get from equipping the Milkweed rune, only possibly even further along since it has grown a leaf. If so, the implications are quite interesting... It's as if she has somehow limited the transformation to just part of herself, becoming kin while retaining her humanity... not unlike Hunters. (EDIT: In fact it's a striking parallel to Hunters being able to beastify just one hand to perform visceral attacks.)
I still have no clue what the doughnut is supposed to be, though. There's nothing in the game I'd say really looks anything like it.

And yeah, I'd spotted the connection to the tidbit from the Old Hunter Trousers myself (rather, I remembered that it was mentioned somewhere, but not specifically which piece of legwear had the lore attached to it). What fascinates me so much about the knights, however, is that they predate the old Hunters, meaning that this superstition existed even before Byrgenwerth discovered their medium of blood healing... which meant that they knew beasts were people even long before the Healing Church.
And the fact that these one-legged statues are found specifically at Cainhurst, along with carvings of a maybe-not-quite-human woman... I must admit, I kind of feel the idea of the Vilebloods having been [I]different[/I] even before the Healing Church galvanize with this.

Also, happy New Year whenever you hit midnight!