i have no idea if this would work with cats or not, but when my doggie got surgery the vet had us put baby socks on her feet so she wouldn't scratch at her stitches, so that might help if you're worried?
Oh my god, that is really cute?? Ahhh that's such a neat idea! Sadly her problem isn't scratching the stitches, it's biting/licking them. I bought a cone but when I put it on her it was the saddest, most pathetic thing I've ever seen... she's not being too bad about it, so I'm not making her wear it at the moment, but we'll see what the vet says on Monday when she has her checkup.