Oh damn D: I hope you figure out something! I’m not sure if you play sims, but there’s a DIY sim plumbob to make out of paper, you’d just need to buy a headband and any outfit would work.
Here’s a link with some instructions:
A cat is cute but kind of basic, but it’s a classic for a reason, and they have lots of cat headbands in even grocery stores around this time of year! Sometimes they have tails too lol?
You could also try dressing up ultra goth, or super punk!