This is something I noticed happening first with the Feast of Fire and Smoke cosmetics such as the training wear. I looked up on the files for the outfits and they don't seem to have anything out of the ordinary. I also compared to another modded set that have virtually the same organization for the jsons and images and I couldn't find anything that may cause that. However, now even the vanilla armors and weapons are being displayed like that, at least for me. What happens is that after equipping an outfit through the wardrobe or manually, after the wardrobe interface is reopened, only the sleeve parts and the headwear are displayed and the rest of the body does not display anything.

I also noticed that if I change to the other races inside the wardrobe, the same thing happens but for the body. Only arms and head are displayed. Clothes on the menu are also not displayed correctly and the saved outfits list, same thing.