Funny enough, I have pictures of the steps of making the braid because I was in the background while other Christmas pics were being taken, so I put cut out the sections and put the steps here. Simple enough:
|1a. Cut a strip of fabric about two inches wide. Cut three such strips and be generous with the length, you will need more than you think as the braiding will shorten them.|
1b. Fold in half long-wise and sew a seam at 5/8" along the strip. It's important to sew exactly 5/8 from the folded edge for it to turn out correctly! You could, of course, use any width you prefer.
2. Attach a safety pin to the end and thread it through, then pull it all the way through to turn the tube you've sewn inside out. The extra fabric remaining in the seam will give some body to the braid; alternately, you could cut the excess off (and zigzag the edge so it won't ravel) to make the braid flatter, or pull some thick yarn through to make it fatter or to keep it "fluffy" for a garment that will be worn a lot.
3. Braid them, turning them so that you keep the seam at the back of the braid. I used the safety pin and wedged it into the sewing machine plate to hold the braid as I worked, moving the pin as needed so that I could keep good tension on the braid and make the braid links all even.
4. Hand sew it on the garment, so that the stitches don't show. I used the machine to zig-zag the end together first, then folded that under and hand sewed it, starting at the zipper edge on the back.
As I was designing, I took a section and ironed it flat to see if I liked it and decided I didn't like it as much as the not-flat version.
I had enough braid left over to make a nice hair piece or something for the flower bouquet, but knowing my daughter and her desire to keep everything very simple, didn't even suggest it;-)