It's all about the stitch.
4 things to consider when detailing a banquette seat (May be translated to back as well)
I love to sew and quilt; and I think that the stitch/seam is to sewing what the joint details are to millwork. I hope that doesn’t SEAM (get it?) too cheesy.
Knowing how and where to specify a specific stitch can drastically alter the appearance of a banquette design. Do you want the seat to have a full & plush appearance? Try a waterfall upholstered front and back edge with a French stich. Or what if you client hates curves and desires only the most minimal of designs? A plain upholstered seat with baseball stitch on the top edges creates a square appearance (in this specific case, consider different foam/cushion specifications as well). For a more residential look, welting on top and bottom edges adds another layer of depth; though always ask for mock ups first in this case.
It’s a small thing, barely noticeable at first. But the stitch can change the appearance of your banquette more than any fabric can. After all design is in the details, the granular.