|Faced buttonholes can be a good choice when you don't want to go "all out" and make welted ones. They have a clean finish and hold up well to heavy use. Faced buttonholes are versatile, as they can be adapted to various shapes and decorative finishes. This is the technique I've used to make oval faced buttonholes that are cut to shape. The illustrated buttonholes are 1 1/2 inches long, made for a 1 1/8-inch button. (For this project, I did the final stitching by hand with topstitching thread. The coat was so heavy and hard to handle that machine stitching the curved shape would have been difficult.)
Start with a strip of matching or contrast fabric; I find this a little easier to work with if it's cut on the bias. Back the strip with lightweight fusible interfacing.
From the fabric strip, cut an oval patch for each buttonhole. The patches need to be about 1 1/2 inches longer than the buttonhole.
Sew around each patch 3/8 inch from the edge. Use a narrow (2.0) zigzag stitch. This will be the finished edge of the completed patch. If your buttonholes and patches are small, you can stitch around the outer edge.
Mark the buttonhole in the center of each patch. Draw an oval shape around the buttonhole mark.
Pin the patches right side down on the outside of the garment.
Use a shorter stitch (ca. 1.5) to stitch the oval you drew around the buttonhole mark. Cut each buttonhole along the straight mark, cutting as close as possible to the end.
Turn the patch to the inside. Make sure the patch doesn't show through the opening on the front. Press well on both front and back sides of the garment.
Trim each patch close to the zigzag stitching line you made earlier, being careful not to cut lining or facing. Edgestitch around the patch using a basting stitch.
On the garment front, topstitch each buttonhole using the basting as a guide. (Completed back) You can use machine stitching, hand stitching, decorative stitching, or even cording /trim. Remove basting thread.