In any 30-year-old car, there’s going to be stuff that just flat wears out. In the case of our 1991 Toyota MR2 Turbo, the parts in constant contact with our sweaty backs, unsurprisingly, were not faring so well.
Our driver’s seat in particular had seen better days, and the leather covering was becoming ripped and worn beyond what we considered presentable …
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I worked in the OEM seating arena for 25 years and I'd suggest that cover is several sizes too big. Post pictures in a few days or weeks, I'd like to see how well it fits then. In my experience it should be tight when it goes on and it would still take a bit of steam to get small wrinkles out. And the operators who assemble seats for a living can put those covers on in 3 or 4 minutes per cushion.
I've been reading about replacing covers for my e30 project car, and one thing that has been mentioned is steaming the foam while the covers are off, it will bring back some of the lift and also provide a tighter fit (and maybe also help with some of the baked in grime). Even a 15$ steamer can evidently make a difference.