ModHomeEcTeacher on Curbly shows you how to sew up your own chevron upholstery fabric.
She writes:

Chevron striped fabrics are no where to be found, so after finding this awning-like fabric, I cut and sewed my own. Fabric cut on the bias is a blessing and a curse. You need the stretch when sewing welt cord, but you don’t need the stretch when sewing flat seams.