Hey, that's pretty cool of you (sorry for the late reply). If you upload it to the website, feel free to link it to me so I can send quest users to it to use :)
You either didn't import the shader (poiyomi) correctly or just need to set the material to poiyomi manually, if it's already installed. It needs to at least be version 7.3.
If you're wondering where the other file is: I deleted it due to the link to the original not only being replaced by this file completely, but due to a "fishy" DMCA.
This file is pretty much replaced by the new outfit I've released, which features this file and its fixes. Go get it here: https://vrcmods.com/item/10317
You have to have the SDK installed, and then import my model. I did a test on a fresh project myself. Install in the order I said: SDK, Poiyomi's, then my model.
If you read the damn description on the damn page, you'd see the same link here, as well as me stating that the file size was too big for the website. The file size is nearly 800mb, while the site only supports 100mb.
It's a 2.0 model because I made it with the default SDK, not the one required for 3.0 avatars. Meaning that, if you use it with the intent on hoping there is 3.0 toggles and stuff, there is not. Not sure why you think I'm lying lmao.