The seat cushion is straightforward. The rest will require a good reupholstery person. Start talking to local people.

Custom is the answer .

I have seen DIY videos where you cover the chair with fabric that has the pattern against the chair. Pin the fabric so it is tight and form fitting. Sew it along the pin lines and then turn it inside out. Voila slipcover.

It is going to be exspensive.

I suggest a two piece cover. With kids and pets a one piece may need tucking every time someone sits in the chair.

https://www.wayfair.com/furniture/pdp/ebern-designs-2-piece-stretch-slipcover-for-accent-chairs-separate-cushion-cover-easy-install-sofa-protector-with-milk-silk-fabric-w116166907.html?piid=453662467

Look up DIY slipcover info- for sewing and w/out sewing. Canvas drop cloths could actually be a ”luxe” and durable fabric option.

If you want someone to sew a slipcover for you- if you live in the vicinity of any dry cleaners, they often have people there that are able to- and might be willing to- sew it. For a fee, of course. Best if you have it all measured and marked and/or pinned up, before you take it to them; so this way, all they have to do is sew. The seat cushion, you can carry into the shop.

Here is some DIY slipcover info that also mentions the canvas dropcloths. You can find a lot of how-to articles, and also videos, online.

https://www.google.com/search?q=diy+slipcuvrr&ie=UTF-8&oe=UTF-8&hl=en-us&client=safari