I’ve written before about my love of mending, especially when I can turn a patch into a “designer detail.”
Start with a backing. For this project I used black Kona cotton; I have also used nonwoven interfacing. Cut the backing considerably bigger than the hole. Flip the sweater inside out, place it carefully on a flat surface without stretching, and baste the backing to the sweater outside the margins of where the designer patch is going to go.
For this star shape, which requires only straight line stitching, I used a walking foot. (For circles or hearts I would probably use a darning foot and drop the feed dogs for free-motion stitching.)
Sew around the patch once or twice. Depending on the shape, you might want to add some stitching in the center of the patch as well as the edges; the more it’s sewed down, the more stable it’s going to be when finished.
Pull the thread ends to the back of the sweater and bury them by running your needle carefully between the backing and the ultrasuede.