Thanks for the report. The Lone Muffin should no longer be showing up in your wardrobe. (If it still does, please wait ~6 hours because it could take a little time for it to update. It should stop showing up after that.)

To get the item out of your wardrobe, could you try removing it from the Account Search page: https://subeta.net/isearch.php?search=the+lone+muffin

If it's in your wardrobe, it should say so on the Account Search page, and give you the option to remove them. Please let me know if that works for you!