I got a California Cover for my previous C2 Vette. They custom-fitted it for rear antenna, side mirrors, etc. I know they make them for First Generation Camaros.
The cover fit perfectly, was lightweight, high-quality, and the soft inner surface did not scratch my paint at all.

 

Universal Indoor Bubble Car Cover (CC12F) by CarCapsule®. 144" L x 72" W x 60" H, with Black Floor. Includes: car capsule, single panel fan, 110V transformer, and filter. Tired of worrying about the harmful elements that can ruin your vehicle? Forget about it! With this inflatable see-thru vinyl bubble cover, your vehicle will be fully protected from insects, dirt, dust, moisture, or any other harmful stuff. Made from 100% PVC vinyl, the cover is ultra strong yet flexible. more details on - https://www.carid.com/car-capsule/in...yABEgIsVPD_BwE

 

+1 for California Car Cover. They use several fabrics. If it is "strictly" a indoor cover...flannel is used a lot by collector guys. They are easily machined washed

I have had their Noah fabric cover for 20 years. 99% garaged but it has been outside even in rain for several days while the 67 occupies the garage for work

 

I bought a Car Bag/ Car Jacket last May and just put it through its first full winter. When I took it out it, it came out exactly as I put it in 4 months prior. Cheaper than the bubbles at $250. The only downside is not being able to access your car easily when its inside. But thats a small price to pay to keep condensation away for me.

Heres a video I made when I put it in for the very first time,