Welcome, @Shelley I'd offer hints and tips, but you'd probably rather do it right
Hi Shelley, and Welcome from me too. You're very brave to be tackling a classic car's upholstery - DH wouldn't have let me anywhere near ours when he was restoring it. Looking forward to seeing how you get on.
Welcome to this very supportive community Shelley from another ex-TSFer. And good luck with the prom dress and classic car upholstery!