Waterproofish car cover

How unfinished? If you aren't worried about paint you could use a waterproof tarp. I put a couple pool noodles over the roof, hood, and trunk then drape the tarp over the top so it leaves room for air to flow. I like these poly tarps that are waterproof and rip/tear proof.

https://www.amazon.com/gp/product/B09M5PDCGT?tag=fabo03-20