I finally have three patterns written up pretty good (Anomalocaris, goldfish, and squid). I just need to redo what I did for the fins. Yeah, the plastic is perfect for getting the kitties attention, but boy do they shred them up pretty good, heh.
Hmm! Maybe denim? Nah, that'd make them too heavy. Something stiff enough to maintain the fins' shape, but soft and light weight...and I'm not well versed in cloth types, 🤔 . Will just have to walk around the fabric dept of a local store.