In all honesty the only way I will do an original seat cover anymore after we had dad's Bolens 1053 seat redone is to take it to an upholstery shop and have them recover it. You have so many options doing it that way and while it could be on the pricey side you can either have it match the original look or do something custom. Till you pay $50 - $75 for a seat cover you can have a shop recover it for a couple bucks more. Just throwing the idea out there.
I edited your post titles for your two posts to help make them a little more descriptive. Helps people find information or reply quicker by seeing a more descriptive title.