Thanks to my client for snapping these step-by-step photos of the process:
Since we didn’t a want a trim, she started by removing the banding.
She added an extra layer of white (with fabric spray adhesive) because the cream of the original shade was showing through the gray fabric when we tested it out.
Fabric glue to attach fabric to inside of shade . . .
Ta-da! Such an easy way to customize a simple lamp and a great way to bring more pattern into your space: