I know exactly what you mean, when I get my interior redone, I am getting those redone so they lay flat and not all pleated/wrinkled. I think it might just be an age thing, I think that look is more associated with the luxury cars of the time vs the sports cars where flat would of seem more sleek/streamlined. Just my $.02.
How would you go about getting those flattened out? Would you need a different door card or just need the material laid flat?