I usually will incorporate some stylish seams to make the material wider where needed.

Or like in my personal car I put seams above the rear windows. Being it is stitched though, you would never know they are there unless someone showed you.

yes i could do this but the car was born with a one piece so there must be a supplier somewhere as the customer wants it to be like original

Reach out to Hyde's Leather, they're the exclusive supplier of automotive-grade Alcantara in North America.