Your writing is on its way to solid, but not quite there. Aside from a few unambiguous grammatical errors ("it's anamalous properties") the biggest problem in your writing is that it tends to be on the more awkward, lengthy side of things. Here are some examples:
SCP-3443 is a pair of large black dress shoes one would typically associate with marital occasions or other important social events. How, where, and by whom SCP-3443 was created is currently unknown.
This can all be replaced with…
SCP-3443 is a pair of large black dress shoes. Its origins are unknown.
It is the emotion of the wearer of SCP-3443 that appears to cause SCP-3443's anomalous properties.
Can be replaced with…
The emotions of SCP-3443's wearer cause its anomalous properties.
Clinical tone does not mean that your sentences have to be needlessly complex. Look at what the original sentence was: the subject is "it," the object is "the emotion of the wearer…", and you're describing the main action of the sentence in a fuckin' adjective clause. Don't do that. The important thing in this sentence is the emotions of SCP-3443's wearer. The important action is that they cause anomalous properties. So make the important thing the subject and make the important action the verb.
certain physical sensations begin to manifest in SCP-3443
This is awkward phrasing, because sensations are something that happen to people; they don't happen in things. Like, you say, "I felt pain in my head," not "I felt pain in my hat".
Most of the article can be gone through in the way I just did. You have a decently solid base of writing ability, but you have a ways to go when it comes to polishing and refining it. I'd recommend, as a good exercise, just going through this entire article and trying to find a simpler, more elegant way of writing each sentence.
The idea is not really doing it for me, although there are some glimmers of interest. At its core, this is a thing that amplifies your emotions and makes them more visceral. The problem is that people experience physical responses to their emotions all the time, and at least for me, imagining these responses as more intense but having the same character is not particularly interesting. In general, amplifying something mundane rarely works, because you didn't really change the character of that mundane thing.
I'd be interested to know if you had any specific imagery in mind when you were writing this, however, because the idea of weird shit happening to your feet is something that can definitely be worked with. If you did have some specific image, it might be worth trying to re-create that idea sans the boring "over the top emotions" mechanic going on in your draft right now.
