I don't think they are all listed anywhere but I can tell you what they do. I don't think I can do spoilers on itch so I'm just going to put it down a few lines so don't look below this if you don't want to know what they do.
The collared jacket, leotard, high-waisted micro-skirt and two-inch black heels are all part of an outfit set. If you buy one and put it on without the others, you'll be unable to buy anything but the other parts of the outfit until you have them all equipped, or you take off all the pieces you have on. Once you have the full set, your body will transform each night, growing your breasts and ass to nearly the maximum sizes, growing your hair and turning it purple, and changing your eye color to purple as well. (The eye color change isn't reflected in the paperdoll or anything though.) Overall it is meant to transform you to look like the character BB from the fate series. The outfit was commissioned when I had a tier for custom cursed items years ago.
The other item in Claire's shop is the holstaur bikini, which will grow your breasts every night, and eventually cause lactation. (Lactation happens in some scenes with large enough breast sizes anyways, so you don't need the bikini for that.) Once the bikini has fully transformed your breasts, you will choose to ask either Claire or Daisy to milk you, and you'll also get a matching pair of bottoms.
The only other cursed item I can remember off the top of my head is the purity ring you can have Beatrice transform into an onahole, which you can then fuck once per day to fully heal your health and regain 1 mana, at the cost of gaining some depravity permanently. I meant to have more cursed equipment like that but never really got around to adding any others.